https://community.appian.com/discussions/f/plug-ins/1580/hi-all-i-have-created-a-new-plugin-to-upgrade-process-instances-from-an-olHi all, I have created a new plugin to upgrade process instances from an old version to a new one. 11:11:26,589 INFO [stdout] (default-threads - 4) ***Exception: java.lang.NullPointerException Initially I created a dummy plugin to verify that it workeden-USTelligent Community 12https://community.appian.com/thread/5590?ContentTypeID=1Fri, 22 Nov 2013 12:41:12 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:d5a38b37-a1ab-4d3c-9494-5a4765c4d9d9jesuspThis is the stack trace:<br />08:40:02,918 ERROR [stderr] (default-threads - 10) java.lang.NullPointerException<br /><br />08:40:02,918 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at com.ebrd.plugins.migrate.Move.run(Move.java:35)<br /><br />08:40:02,919 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:101)<br /><br />08:40:02,919 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at com.appiancorp.process.runtime.framework.DefaultActivityExecutor$1.call(DefaultActivityExecutor.java:98)<br /><br />08:40:02,919 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at com.appiancorp.common.ContextClassLoaderSwitcher.runInContext(ContextClassLoaderSwitcher.java:25)<br /><br />08:40:02,919 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at com.appiancorp.process.runtime.framework.DefaultActivityExecutor.execute(DefaultActivityExecutor.java:98)<br /><br />08:40:02,920 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute(UnattendedJavaActivityRequest.java:83)<br /><br />08:40:02,920 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at com.appiancorp.process.engine.UnattendedJavaActivityRequest.execute0(UnattendedJavaActivityRequest.java:55)<br /><br />08:40:02,920 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at com.appiancorp.process.engine.ContinuationRequest.execute(ContinuationRequest.java:80)<br /><br />08:40:02,920 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at com.appiancorp.mdb.UnattendedRequestHandlerBean.onMessage(UnattendedRequestHandlerBean.java:17)<br /><br />08:40:02,920 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br /><br />08:40:02,920 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)<br /><br />08:40:02,921 ERROR [stderr] (default-threads - 10) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)<br /><br /><br /><div style="clear:both;"></div>