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I have been getting a lot of exceptions from code synch recently (dev nov 28), usually when it pops up automatically IIRC. Usually they are not reproducible; often after dismissing the exception dialog I can just choose Tools | Synchronize and then it generally works. Here is an example; not sure if there are other types of exception too.
Created attachment 8240 [details] Stack trace
Exception fixed in trunk. This problem was already fixed in prj40_prototype branch.
*** Issue 28573 has been marked as a duplicate of this issue. ***
Verified