You can delete errors from within the Backtrace UI by using the trash can icon next to the crash when looking at the group view:

You can also delete objects via the command-line by using the morgue command-line tool

For example, if you wish to delete errors with IDs 10a1, 10a2, and 10a3 from the project "projectname":  morgue delete projectname 10a1 10a2 10a3 

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