Kaltura_Client_Exception thrown

Invalid KS "Yjg2YzE3MGE5MWZjMmY4NGU1OTRkOGIxZjM0ZjdkYzBhNjEwN2IzNnwxMDE7OzE0Njk1NzIwMTA7MjsxNDY5NDg1NjEwLjEyNDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"