Seemingly random error message

Hello, i am looking for some info for an error message that i seem to get randomly, i have tried commenting out rules to troubleshoot but it just seems to appear randomly.

Does the error make any sense to anyone?

2015-09-29 15:07:45.471 [ERROR] [org.quartz.core.JobRunShell ] - Job DEFAULT.2015-09-29T15:07:45.367+02:00: Proxy for org.eclipse.xtext.xbase.lib.Procedures$Procedure0: org.eclipse.xtext.xbase.impl.XClosureImplCustom@6af452 (explicitSyntax: true) threw an unhandled Exception:
java.lang.RuntimeException: The name ‘’ cannot be resolved to an item or type.
at org.openhab.model.script.interpreter.ScriptInterpreter.internalFeatureCallDispatch(ScriptInterpreter.java:67) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._evaluateAbstractFeatureCall(XbaseInterpreter.java:658) ~[na:na]
at sun.reflect.GeneratedMethodAccessor288.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0]
at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:218) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._evaluateAbstractFeatureCall(XbaseInterpreter.java:657) ~[na:na]
at sun.reflect.GeneratedMethodAccessor288.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0]
at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:218) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._evaluateBlockExpression(XbaseInterpreter.java:321) ~[na:na]
at sun.reflect.GeneratedMethodAccessor293.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0]
at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:218) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluate(XbaseInterpreter.java:204) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.ClosureInvocationHandler.doInvoke(ClosureInvocationHandler.java:46) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.AbstractClosureInvocationHandler.invoke(AbstractClosureInvocationHandler.java:28) ~[na:na]
at com.sun.proxy.$Proxy81.apply(Unknown Source) ~[na:na]
at org.openhab.model.script.internal.actions.TimerExecutionJob.execute(TimerExecutionJob.java:44) ~[na:na]
at org.quartz.core.JobRunShell.run(JobRunShell.java:213) ~[quartz-all-2.1.7.jar:na]
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:557) [quartz-all-2.1.7.jar:na]
2015-09-29 15:07:45.580 [ERROR] [org.quartz.core.ErrorLogger ] - Job (DEFAULT.2015-09-29T15:07:45.367+02:00: Proxy for org.eclipse.xtext.xbase.lib.Procedures$Procedure0: org.eclipse.xtext.xbase.impl.XClosureImplCustom@6af452 (explicitSyntax: true) threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception.
at org.quartz.core.JobRunShell.run(JobRunShell.java:224) ~[quartz-all-2.1.7.jar:na]
at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:557) [quartz-all-2.1.7.jar:na]
Caused by: java.lang.RuntimeException: The name ‘’ cannot be resolved to an item or type.
at org.openhab.model.script.interpreter.ScriptInterpreter.internalFeatureCallDispatch(ScriptInterpreter.java:67) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._evaluateAbstractFeatureCall(XbaseInterpreter.java:658) ~[na:na]
at sun.reflect.GeneratedMethodAccessor288.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0]
at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:218) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._evaluateAbstractFeatureCall(XbaseInterpreter.java:657) ~[na:na]
at sun.reflect.GeneratedMethodAccessor288.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0]
at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:218) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter._evaluateBlockExpression(XbaseInterpreter.java:321) ~[na:na]
at sun.reflect.GeneratedMethodAccessor293.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0]
at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0]
at org.eclipse.xtext.util.PolymorphicDispatcher.invoke(PolymorphicDispatcher.java:291) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.internalEvaluate(XbaseInterpreter.java:218) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.XbaseInterpreter.evaluate(XbaseInterpreter.java:204) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.ClosureInvocationHandler.doInvoke(ClosureInvocationHandler.java:46) ~[na:na]
at org.eclipse.xtext.xbase.interpreter.impl.AbstractClosureInvocationHandler.invoke(AbstractClosureInvocationHandler.java:28) ~[na:na]
at com.sun.proxy.$Proxy81.apply(Unknown Source) ~[na:na]
at org.openhab.model.script.internal.actions.TimerExecutionJob.execute(TimerExecutionJob.java:44) ~[na:na]
at org.quartz.core.JobRunShell.run(JobRunShell.java:213) ~[quartz-all-2.1.7.jar:na]
… 1 common frames omitted

It looks like you are referencing an item in a rule or script that doesn’t exist. The easiest way to find and correct these sorts of errors I’ve found is to load your config files into Designer and go through them file by file. Designer will catch and highlight these sorts of errors by underlining them in red.

Thanks, i’ve not used designer for a long time due to problems with java environment clashes, but i think it could be a good idea to revisit it on another pc. thanks for the response, i appreciate your time.