CMake Error: Expected a command name, got unquoted argument with text

[emilio-cartoni]

When building the new version (1fa0a77) of the repository (i.e. when doing the catkin_make -j8), we got the following error:

CMake Error at CMakeLists.txt:1:
Parse error. Expected a command name, got unquoted argument with text
"/opt/ros/noetic/share/catkin/cmake/toplevel.cmake".

We then followed an advice in Stackoverflow and deleted the file src/CMakeLists.txt.
After that, catkin_make -j8 compiled sucessfully.
Not sure why this happened since src/CMakeLists.txt existed in previous version and we didn't encounter the error, but I am reporting it here in case it happens to someone else.

[yanghuan6]

CMakeLists.txt file has extra blanks, you need to delete those blanks. After that, this question is gone.