Hello to everyone!

Our team is trying to upgrade Pega from 8.3.1 to 8.6.2 (out-of-place upgrade). We`ve created empty RULES_new and TMPDATA schemes and successfully migrated RULES and DATA respectively. 

Next step is to upgrade RULES_new using upgrade.sh and here we got an error:

2021-12-16 11:00:08,238 (com.pega.pegarules.boot.internal.ex)  SEVERE - Problem during method invocation (main)
     [java] 
     [java] com.pega.pegarules.pub.PRException: PRException
     [java] From: (unknown) 
     [java] 	at com.pega.pegarules.deploy.internal.archive.importer.synchronization.AppBundleSynchronizer.performSynchronization(AppBundleSynchronizer.java:82)
     [java] 	at com.pega.pegarules.deploy.internal.archive.importer.ArchiveImporterAbstract.importArchive(ArchiveImporterAbstract.java:47)
     [java] 	at com.pega.pegarules.deploy.internal.archive.importer.ArchiveImporterAbstract.importArchive(ArchiveImporterAbstract.java:28)
     [java] 	at com.pega.pegarules.deploy.internal.archive.importer.Upgrader.handleArchive(Upgrader.java:178)
     [java] 	at com.pega.pegarules.deploy.internal.archive.importer.AppBundleHandler.deploy(AppBundleHandler.java:101)
     [java] 	at com.pega.pegarules.deploy.internal.archive.importer.Upgrader.runUpgrade(Upgrader.java:71)
     [java] 	at com.pega.pegarules.deploy.external.util.UpgradeUtil.main(UpgradeUtil.java:73)
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     [java] 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
     [java] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     [java] 	at java.lang.reflect.Method.invoke(Method.java:498)
     [java] 	at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:388)
     [java] 	at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:430)
     [java] 	at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:225)
     [java] 	at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:274)
     [java] 	at com.pega.pegarules.pub.PegaRULES.main(PegaRULES.java:86)

Full upgrade log is attached. It seems, that something`s wrong with an exposion of a property, however i can`t understand the root cause. 

Can someone help with that?