- the IDE is installed on a short, simple path like C:\ST\ not containing white space, umlauts, and other "difficult" chars that the underlying software cannot properly handle
- there are no competing other compiler toolchains on the path.
Could you check the include paths of the project and make sure that the path "../Drivers/STM32F3xx_HAL_Driver/Inc" is included. If it is not the case, it may be causing the problem you have found.