Kaltura_Client_Exception thrown

Invalid KS "NjdiOWYyZDkzOWMyMTJjYzMwZWM5MDZlZGMyMmU3N2E1MzEzMmZmOXwxMDE7OzE0OTA1MzU4MzQ7MjsxNDkwNDQ5NDM0LjgwMjE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"