Missing Exception for when function block files are missing

[jmotp]

Traceback (most recent call last):
File "/home/pi/Desktop/dinasore-4diac-IDE-2.0-compatible/core/main.py", line 114, in
m.build_ua_manager_fboot(address, port_opc)
File "/home/pi/Desktop/dinasore-4diac-IDE-2.0-compatible/core/manager.py", line 238, in build_ua_manager_fboot
self.manager_ua_fboot.from_fboot()
File "/home/pi/Desktop/dinasore-4diac-IDE-2.0-compatible/data_model_fboot/ua_manager.py", line 94, in from_fboot
self.parse_fboot(file)
File "/home/pi/Desktop/dinasore-4diac-IDE-2.0-compatible/data_model_fboot/ua_manager.py", line 106, in parse_fboot
self.generate_function_blocks(lines)
File "/home/pi/Desktop/dinasore-4diac-IDE-2.0-compatible/data_model_fboot/ua_manager.py", line 124, in generate_function_blocks
fb_file = open(os.path.join(root_path, '{0}.fbt'.format(child.get('Type'))), 'r')
File "/usr/lib/python3.9/posixpath.py", line 76, in join
a = os.fspath(a)
TypeError: expected str, bytes or os.PathLike object, not NoneType

This error can mean that the Function Block files are missing