"Alarm Clock" from wiki fails (sometimes)?

Hello Guys.
I’m trying to use the Alarm Clock from the OH1 Wiki - sometimes it works like it should, but often i get the following error in the log and the timer wouldn’t fire:
If i change the time now, to trigger now+10 minutes, the timers work perfect… But do i set them for 22.30 it makes the error:

2016-11-06 22:14:51.355 [ERROR] [org.quartz.core.JobRunShell         ] - Job DEFAULT.2016-11-05T22:14:51.178+01:00: Proxy for org.eclipse.xtext.xbase.lib.Procedures$Procedure0: [ | {
  var day2
  org.eclipse.xtext.xbase.impl.XIfExpressionImpl@53d10b28
  <XFeatureCallImplCustom>.reschedule(<XMemberFeatureCallImplCustom>)
  logInfo(<XStringLiteralImpl>,<XStringLiteralImpl>)
} ] threw an unhandled Exception: 
java.lang.RuntimeException: The name '<unkown>' cannot be resolved to an item or type.
	at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:112)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:901)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:864)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:223)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluateArgumentExpressions(XbaseInterpreter.java:1115)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1045)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:991)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:114)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:901)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:225)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluateArgumentExpressions(XbaseInterpreter.java:1115)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1045)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:991)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:114)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:901)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:225)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluateArgumentExpressions(XbaseInterpreter.java:1115)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1045)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:991)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:114)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:901)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:225)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluateArgumentExpressions(XbaseInterpreter.java:1115)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1045)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:991)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:114)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:901)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:225)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluateArgumentExpressions(XbaseInterpreter.java:1115)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1045)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:991)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:114)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:901)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:225)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluateArgumentExpressions(XbaseInterpreter.java:1115)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1045)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:991)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:114)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:901)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:225)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluateArgumentExpressions(XbaseInterpreter.java:1115)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1045)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:991)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:114)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:901)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:225)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluateArgumentExpressions(XbaseInterpreter.java:1115)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._invokeFeature(XbaseInterpreter.java:1045)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.invokeFeature(XbaseInterpreter.java:991)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.smarthome.model.script.interpreter.ScriptInterpreter.invokeFeature(ScriptInterpreter.java:114)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:901)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:225)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:457)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:243)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._doEvaluate(XbaseInterpreter.java:446)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.doEvaluate(XbaseInterpreter.java:227)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:203)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluate(XbaseInterpreter.java:189)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.ClosureInvocationHandler.doInvoke(ClosureInvocationHandler.java:46)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at org.eclipse.xtext.xbase.interpreter.impl.AbstractClosureInvocationHandler.invoke(AbstractClosureInvocationHandler.java:29)[139:org.eclipse.xtext.xbase:2.9.2.v20160428-1452]
	at com.sun.proxy.$Proxy114.apply(Unknown Source)[:]
	at org.eclipse.smarthome.model.script.internal.actions.TimerExecutionJob.execute(TimerExecutionJob.java:38)[123:org.eclipse.smarthome.model.script:0.9.0.b1]
	at org.quartz.core.JobRunShell.run(JobRunShell.java:202)[101:org.eclipse.smarthome.core.scheduler:0.9.0.b1]
	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)[101:org.eclipse.smarthome.core.scheduler:0.9.0.b1]

The timer code:

rule "fjern Blokering Lys Nord"
when
    Item timeclock2_Hour changed or 
    Item timeclock2_Minute changed
then
  // Lock gøres for at sikre der ikke ændre fra UI mens OH læser rule igennem
  lock2.lock()
  try {
    var String msg2 = ""

    // Copy the Alarm-Time from the UI to local variables
   // var hours = timeclock2_Hour.state as DecimalType
   // var minute = timeclock2_Minute.state as DecimalType

    // Combine the hour and minutes to one string to be displayed in the 
    // user interface
    if (timeclock2_Hour.state < 10) { msg2 = "0" } 
    msg2 = msg2 + timeclock2_Hour.state.format("%d") + ":"

    if (timeclock2_Minute.state < 10) { msg2 = msg2 + "0" }
    msg2 = msg2 + timeclock2_Minute.state.format("%d")
    postUpdate(timeclock2_settime,msg2)

    // calculate the alarm time [min]
    var int alarmtime2
    alarmtime2 = (timeclock2_Hour.state as DecimalType).intValue * 60 + 
                (timeclock2_Minute.state as DecimalType).intValue
    alarmtime2 = alarmtime2.intValue

    // calculate current time [min]
    var int now2
    now2 = now.getMinuteOfDay
    now2 = now2.intValue

    // calculate the difference between the requested alarm time and 
    // current time (again in minutes)  
    var int delta2
    delta2 = (alarmtime2 - now2)
    delta2 = delta2.intValue

    // add one day (2440 minutes) if alarm time for today already passed
    if (now2 > alarmtime2) { delta2 = delta2 + 2440 }

    // check if there is already an alarm timer; cancel it if present
    if (timer2 != null) {
       timer2.cancel
      // timer2 = null
    }

    // create a new timer using the calculated delta [min]
    timer2 = createTimer(now.plusMinutes(delta2)) [|
        // This code will be executed if the timer triggers
        // ************************************************
        // check if alarm clock is armed for this weekday
        var Number day2 = now.getDayOfWeek
        if (((day2 == 1) && (timeclock2_Monday.state == ON))     ||
            ((day2 == 2) && (timeclock2_Tuesday.state == ON))   ||
            ((day2 == 3) && (timeclock2_Wednesday.state == ON))   ||
            ((day2 == 4) && (timeclock2_Thursday.state == ON)) ||
            ((day2 == 5) && (timeclock2_Friday.state == ON))    ||
            ((day2 == 6) && (timeclock2_Saturday.state == ON))    ||
            ((day2 == 7) && (timeclock2_Sunday.state == ON))) {
                // The things to do if the alarm clock is enabled for this day of week: 
                sendCommand(time_block_light_North, OFF)
                               	logInfo("ugetimer", "Blokering OFF")
           }
           // Re-Arm the timer to trigger again tomorrow (same time) 
           	timer2.reschedule(now.plusHours(24))
           	               	logInfo("ugetimer", "Blokering OFF 2")
        // ************************************************
        // Here the code ends that executes once the timer triggers 
        	
        ]
  } finally  {
     // release the lock - we are ready to process the next event
     lock2.unlock()
  }
end