I have a small C project with just a main.c, which I want to open, while I have another C project opened before hand.
I found a thread, that addressed a similar problem, where a teacher was guided to go to "Settings->Environment->General settings->Untick Allow only one running instance".
If I do that, the error disappears and I got a waiting hour glass for a little time when clicking on the cbp file and and noting visible happens.
Anyone who can help?