Debugger: System error. Attempt to access invalid address

When i start debugger from one old large specific directory (which is full of files from the times of FTN77) after i click F6 i always get this message. I think i have seen similar complaint but could not find it here.

The debugger still works fine after i just ignore the message. There is no other salflibc files in this dir. I see the file circa year 2000 called sdbg.dbg but removing it did not change anything. Just curious where this comes from?

Does the error appear in a message box?

Yes the message is normal amicable windows GUI box not a crash Command Prompt warning. And if i move EXE file to different dir and launch debugger from there this message does not appear

BTW, if i will use Search for 'F6' then it does not find even my own post above

From the places this error could come from ... it isn't at all obvious why it would happen. Is there an old salflibc.dll in that directory?

No, i checked, no old lib in this dir. I will probably find that myself, it's only 578 files in this dir, so it only will take 9 runs to do that 😃