openocd binary not found
If you go into your debug configuration, under the debugger tab, can you change the GDB command and OpenOCD command to point directly to the executable and avoid openstm32_openocd_path?
I had the same problem for a while, I believe pointing directly to the executable worked, but to really get the path variable correct I had to reinstall system workbench and OpenOCD. I don't remember what order I used, it was not a fun time.