login and pay with amazon error

ver 2.0.3.1
login and pay with amazon payment module
I go to the module enter the mws information
click the save button
and get Internal server error
Error log says
2015-07-28 4:00:51 - PHP Notice: Undefined offset: 1 in \amazon_login_pay.php on line 368
2015-07-28 4:00:51 - PHP Notice: Undefined offset: 2 in \amazon_login_pay.php on line 371
2015-07-28 4:00:51 - PHP Notice: Undefined offset: 1 in \amazon_login_pay.php on line 371

anyone know what is going on and how to fix it?

Can anyone help with this. I really would like to get Login and pay with amazon up and running. I contacted amazon, but they were no help. They just said it is an opencart problem.