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Questions relating to designing PCBs
By Blocks
#55461
When copying a footprint from one library to another, I inadvertently got some extra layers in my library. I could delete all of them except two (numbered 50 and 56). When I try to delete them, I get an error message: "Can't delete internal layers!"

I've tried deleting them via the GUI and the command prompt. Does anybody have any ideas? They aren't causing me any trouble, but it's just kind of annoying....