Kaltura_Client_Exception thrown

Invalid KS "MDQ4Y2VhYzllNDJjNzZjY2ZkNmY2YTNjOGRlZjJiZmIxZTNlZjVmYnwxMDE7OzE0ODA4Mjc2NjY7MjsxNDgwNzQxMjY2LjQ3Njc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"