Kaltura_Client_Exception thrown

Invalid KS "ZjkzYmIxMWU4Y2Y4MmE5NWYyMDRkYWI5Y2M2NGQzOWYwZjgxYTZjZXwxMDE7OzE0OTg3NzEyMDE7MjsxNDk4Njg0ODAxLjg3ODg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"