Unexpected state Error for task task name

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You can encounter this error when the science application has somehow become corrupted. It's also possible that BOINC does not have the right permissions to do read/write operations in its data directory.

Corruption can be solved by detaching from the project and reattaching (this deletes everything in the project's folder and downloads all necessary items anew); Permission trouble can only be solved by uninstalling and reinstalling BOINC.