Error in final launch sequence
Lots of things can cause this.
1. Check if you have ST-LinkV2-1 or ST-LinkV2 (mine was ST-LinkV2).
- There is a .cfg file in your project directory which says what it is
(can't remember where its set).
2. The reset pin needs pull up of 10K. If not fitted or connected, then
change reset line in file .cfg to read reset_config none separate
This sends reset command through swd interface.
There are probably a lot of other things that can cause similar issue.
Just hope you find these helpful.