I faced to a similar problem (by an OpenOCD set-up) and found this post.
I’m using SW4STM32 v2.8 for Windows.
In my case, I could resolve the problem by once removing (project-name).xml file in the project folder, delete the debug configuration (Run -> Debug Configurations..., and delete one), re-generated the debug configuration and relaunch debug. (The XML file will be generated if not exist, but doesn’t seem to be updated if the information in it is outdated.)
In my case, the XML file, which was copied from other project, contained wrong information in it.
I hope it helps.