Fatal error: no input files

Hey guys,

I am new to stm32 microcontrollers.

I am using CubeMX to generate my projects. I already accomplished to start a new project with the board STM32WB55 Nucleo and to program the timer / leds etc.

However, if I try to build an example project from CubeMX, I am unable to build it. The error message saying "fatal error: no input files". I checked the path and location and the file is actually there.(see attachment).

I have been searching the internet for hours to find a solution. I hope one of you guys can help.

Kind regards

René