Kaltura_Client_Exception thrown

Invalid KS "OWRlYWE5ZmUyODhhOTc3MDE5ZTg2ZTMxYzhhMWE1Y2MxOTE4YzNiNHwxMDE7OzE1MDA3NDk2OTA7MjsxNTAwNjYzMjkwLjkwNTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"