Workflow rule "jetbrains-youtrack-workTimer->Stop timer" threw an exception in project

Workflow rule "jetbrains-youtrack-workTimer->Stop timer" threw an exception in
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My logs show something like this:
ERROR Workflow runtime exception

java.lang.RuntimeException: No localized entry with id 'Stop_timer.The_work_item_automatically_added_by_the_timer'.

…

java.lang.RuntimeException: No localized entry with id 'Stop_timer.The_work_item_automatically_added_by_the_timer'.
 at jetbrains.mps.internationalization.runtime.Localizer.getDefaultMsg(Localizer.java:72)
 at jetbrains.mps.internationalization.runtime.Localizer.localizedMsg(Localizer.java:56)
 at jetbrains.youtrack.workflow.wrappers.WFLocalizer.getMessage(WFLocalizer.java:22)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.mozilla.javascript.MemberBox.invoke(MemberBox.java:161)
 at org.mozilla.javascript.NativeJavaMethod.call(NativeJavaMethod.java:247)
 at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:76)
 at org.mozilla.javascript.gen.c82._c44(initialscript.js:398)
 at org.mozilla.javascript.gen.c82.call(initialscript.js)
 at org.mozilla.javascript.optimizer.OptRuntime.callName(OptRuntime.java:97)
 at org.mozilla.javascript.gen.c83._c2(jetbrains-youtrack-workTimer->Stop timer:20)
 at org.mozilla.javascript.gen.c83.call(jetbrains-youtrack-workTimer->Stop timer)
 at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:398)
 at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)
 at org.mozilla.javascript.gen.c83.call(jetbrains-youtrack-workTimer->Stop timer)
 at org.mozilla.javascript.JavaAdapter.doCall(JavaAdapter.java:578)
 at org.mozilla.javascript.JavaAdapter.callMethod(JavaAdapter.java:553)
 at adapter2.action(<adapter>)
 at jetbrains.youtrack.workflow.model.StatelessRule.handle(StatelessRule.java:45)
 at jetbrains.youtrack.workflow.model.StatelessRule$1.invoke(StatelessRule.java:91)
 at jetbrains.youtrack.workflow.model.RhinoRuleLoader.runInContext(RhinoRuleLoader.java:83)
 at jetbrains.youtrack.workflow.model.StatelessRule.handleBeforeFlush(StatelessRule.java:84)
 at jetbrains.youtrack.workflow.ext.WorkflowIssueListener.beforeFlush(WorkflowIssueListener.java:137)
 at com.jetbrains.teamsys.dnq.database.TransientSessionImpl$4.visit(TransientSessionImpl.java:1039)
 at com.jetbrains.teamsys.dnq.database.TransientEntityStoreImpl.forAllListeners(TransientEntityStoreImpl.java:315)
 at com.jetbrains.teamsys.dnq.database.TransientSessionImpl.notifyBeforeFlushListeners(TransientSessionImpl.java:1036)
 at com.jetbrains.teamsys.dnq.database.TransientSessionImpl.beforeFlush(TransientSessionImpl.java:931)
 at com.jetbrains.teamsys.dnq.database.TransientSessionImpl.flushChanges(TransientSessionImpl.java:722)
 at com.jetbrains.teamsys.dnq.database.TransientSessionImpl.flush(TransientSessionImpl.java:155)
 at jetbrains.youtrack.agile.sprint.rest.VersionSprintSubresource.moveIssue(VersionSprintSubresource.java:522)
 at jetbrains.youtrack.agile.sprint.rest.VersionSprintSubresource.post_IssueIssue(VersionSprintSubresource.java:390)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)

In previous version I could move such issues between these states. Do I miss something? Do I have to update something else in order to get youtrack-5.0 run ?

Any hints are welcome.

Best Regards,
Tilman