Symptoms
java.lang.IllegalStateException: Unable to find model version in file /cust/app/jira/temp/activeobjects.xml860047787519460231snapshot.tmp.xml
at com.botronsoft.jira.rollout.model.util.EcoreCustomUtil.getModelVersion(EcoreCustomUtil.java:92)
at com.botronsoft.jira.rollout.model.migration.impl.ModelMigrationServiceImpl.migrate(ModelMigrationServiceImpl.java:138)
at com.botronsoft.jira.rollout.impl.ModelLoader.loadModel(ModelLoader.java:50)
at com.botronsoft.jira.rollout.impl.JiraConfigurationResourceServiceImpl.loadModel(JiraConfigurationResourceServiceImpl.java:36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Cause
Failures in EcoreCustomUtil.getModelVersion are caused by uploads of a non-snapshot file or a manually modified one.
Resolution
Make sure you're uploading a valid snapshot file that is not manually edited or in any other way corrupted (copying snapshots between VMs is a common case for this).
Try to download the snapshot file again. If the file is with a bigger size you could decide to exclude the attachments as described in this wiki page: Moving attachments
If the problem persists validate the integrity of the ZIP file (the actual steps depends on the operating system of the client machine).