chore: do error on purpose to fail travis job

Author: dtopuzov

core/utils/file_utils.py

@@ -139,7 +139,7 @@ def clean(path):
         if os.path.isfile(path):
             File.write(path, text='')
         else:
-            raise IOError('Error: %s file not found' % path)
+            raise FileNotFoundError('Error: %s file not found' % path)
 
     @staticmethod
     def find_by_extension(folder, extension):