Caldav error

Hi

I’m new to Openhab and am making progress slowing. However there is one error that I can’t seem too overcome and no matter how much I search for the answer on forums and google I can’t find what I’m doing wrong.

I am using Google Calendar and keep getting this error:

2016-08-14 20:40:25.345 [DEBUG] [o.o.i.c.i.job.EventReloaderJob] - loading resource: /calendar/dav/XXXXXX@gmail.com/events/27hgpvo85qjp3asaplop7ra2n8@google.com.ics
2016-08-14 20:40:25.507 [DEBUG] [o.o.i.c.i.job.EventReloaderJob] - loading resource: /calendar/dav/XXXXXX@gmail.com/events/48ens77o58te4b7tbv1hrev3j8@google.com.ics
2016-08-14 20:40:25.708 [ERROR] [o.o.i.c.i.job.EventReloaderJob] - error while loading calendar entries: null
java.lang.NullPointerException: null
at org.openhab.io.caldav.internal.job.EventReloaderJob.loadEvents(EventReloaderJob.java:333) ~[na:na]
at org.openhab.io.caldav.internal.job.EventReloaderJob.loadEvents(EventReloaderJob.java:290) ~[na:na]
at org.openhab.io.caldav.internal.job.EventReloaderJob.execute(EventReloaderJob.java:126) ~[na:na]
at org.quartz.core.JobRunShell.run(JobRunShell.java:213) [quartz-all-2.1.7.jar:na]

    at org.openhab.io.caldav.internal.job.EventReloaderJob.execute(EventReloaderJob.java:126) ~[na:na]
    at org.quartz.core.JobRunShell.run(JobRunShell.java:213) [quartz-all-2.1.7.jar:na]

I am running Openhab 1.8.3 on a RPi3

Please can anyone help???