Runtime Error: RBAppearancePak

Running Mac app in the debugger I get the following error:

Location: Common/plugin.cpp:5783
Condition: false
Message: Could not open plugin RBInternetEncodings.xojo_plugin:0

Then is crashes.

I have also got the same thing with: plugin RBAppearancePak.xojo_plugin:0ac.local RVCal

Have no clue to what this is?

Me neither, but I would try to reinstall Xojo or try it with an older version. I have many different versions going back to RB 2007 on my Mac which happily co-exist with each other.

Also try a restart. After running Xojo for a long time it sometimes becomes confused and starts to do weird things. A restart of the computer usually fixes that.