[xwiki-users] upgrade error from 4.4.1 to 4.5M1

Hi all, i get this error message on install Xwiki-Enterprise UI 4.5M1 any help here ? thanks and best regards Stefan -#-#-#-#- Tried to remove non-existing property [job.extension.plan] from execution context. Failed to create install plan: Left side ($argument.size()) of '>' operation has null value at /templates/extension.vm[line 861, column 32] class org.xwiki.extension.InstallException: Failed to create install plan: Left side ($argument.size()) of '>' operation has null value at /templates/extension.vm[line 861, column 32] at org.xwiki.extension.job.internal.InstallJob.start(InstallJob.java:112) at org.xwiki.job.AbstractJob.start(AbstractJob.java:134) at org.xwiki.job.internal.DefaultJobManager.run(DefaultJobManager.java:155) at java.lang.Thread.run(Thread.java:679) #-#-#-#- -- View this message in context: http://xwiki.475771.n2.nabble.com/upgrade-error-from-4-4-1-to-4-5M1-tp75836… Sent from the XWiki- Users mailing list archive at Nabble.com.