Invalid output from server (sync3.8)

I have this problem with this new version of sync. I created my database on a windows machine, which syncs well to the server.
My ubuntu machine can not sync to the server. Error Msg:

[JavaScript Error: "[Exception... "'Invalid output from server (Report ID: 36da4e0dce)' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>" data: no]"]

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