Kaltura_Client_Exception thrown

Invalid KS "M2NjNWRlZTdhZjNjMzcwNTIwMTFlZWVkZGRjNWNiOGI0MThiYjJjMnwxMDE7OzE0ODE0MjY2MDI7MjsxNDgxMzQwMjAyLjgwMzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"