Exception refreshing token with cmd

I am having an error which says Exception refreshing token with cmd. 2021-03-23 10:51:26.153: Exception refreshing token with cmd full_path/get_token.py. Error: invalid syntax (<unknown>, line 1)

I have passed token with

dotnet Restler.dll test --grammar_file Compile/grammar.py \
             --dictionary_file Compile/dict.json \
             --settings Compile/restler_user_settings.json \                  
             --token_refresh_command "/full_path/token.py" \
             --token_refresh_interval 720