STM32 products are nothing but problems ... ;(
I just started to learn the tool. I had trouble loading an example code (using File->Open projects from File System). I needed to bring the folder close to top of the directory (e.g. C:\ or D:\), otherwise, some files may have names too long in the path and they do not exist. I also needed to select the right folder (named project) as the "project". When compiling, sometimes, I had to click "Project -> Build All" twice to get rid of errors.
It is certainly not straight forward. All of the above was through trial and error. I looks like it will take me sometime to learn how to walk.