Trying to castle by clicking on King then on rook crashes program

[JuggleHacker]

Trying to castle by clicking on King then on rook crashes program.
Stack trace:
Traceback (most recent call last):
File "\python_easy_chess_gui.py", line 3578, in
main()
File "\python_easy_chess_gui.py", line 3574, in main
pecg.main_loop()
File "\python_easy_chess_gui.py", line 3535, in main_loop
start_new_game = self.play_game(window, engine_id_name, board)
File "\python_easy_chess_gui.py", line 2055, in play_game
self.update_rook(window, str(user_move))
File "*\python_easy_chess_gui.py", line 1543, in update_rook
self.psg_board[self.get_row(fr)][self.get_col(fr)] = BLANK
UnboundLocalError: local variable 'fr' referenced before assignment

[fsmosca]

Thanks, to castle, use e1g1 or e1c1 or e8g8 or e8c8.

I will try to fix it not to crash.