We got this error while importing all entities from our production to aur QA box.
Please let us know if we are missing something, this looks like a Thingworx Resources thing
2014-05-19 10:49:44.885-0500 Unable to process import: Unable To Create Resource Instance From Class: com.thingworx.resources.universalconverter.UniversalConverter
2014-05-19 10:49:44.889-0500 unable to unregister ISessionObserver for JID = administrator@thingworx.com because it was not in the observers map.
2014-05-19 10:49:44.896-0500 unable to unregister ISessionObserver for JID = system@thingworx.com because it was not in the observers map.
2014-05-19 10:49:47.131-0500 Internal error: java.lang.Exception: Import Failed: Unable To Create Resource Instance From Class: com.thingworx.resources.universalconverter.UniversalConverter
Hi Xavier,
The UniversalConverter is an extension, which you will need to import before importing Entities and data. I recommend removing your ThingworxStorage directory, deploying ThingWorx, importing any relevant extensions and attempt the import again.
Thanks,
Adam