Fixed errornous variable name.

generate.py

@@ -48,12 +48,12 @@ def create_dir(filename):
     removal if it exists.
     """
     try:
-        os.makedirs(path)
+        os.makedirs(filename)
     except FileExistsError:
         if not query_yes_no('Folder exists, remove?', default='yes'):
             return False
-        shutil.rmtree(path)
-        os.makedirs(path)
+        shutil.rmtree(filename)
+        os.makedirs(filename)
     return True
 
 def create_header(headerfile, experiment, destination):