This pc only generates client errors. The confusing part is that the tasks run fine to 100%, and only after uploadng and reporting the task shows up on my account page as "Client Error". The Task Details do not offer any clue about what went wrong.
I have reset Rosetta and had Boinc download all required files again but the problem still exists.

Any help is appreciated

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See this thread.

Unless you want to try to downgrade to BOINC v6 (not easy and didn't work for everyone), the only thing you can do is crunch something else untill they fix this.

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Its old known bug. But still no fix to it. You need to choose another dc project for this PC. It can not work for R@H while bug is not fixed. (daily daily WU quota will be cut to 1/day soon because of 100% error rate, and PC cant get new tasks from R@H).
Read Current issues with 7+ boinc client for more information.
And post link to your PC as additional example.

Thanks for this information. I will keep this pc busy with some of the other projects until this is fixed.