My app refuses to host on railwayapp

I have added my secret_key and Debug to my variables on on railway, yet it still crashes but it runs on my local machine.this is my error {
raise UndefinedValueError(‘{} not found. Declare it as envvar or define a default value.’.format(option))
decouple.UndefinedValueError: db_NAME not found. Declare it as envvar or define a default value.}