Kaltura_Client_Exception thrown

Invalid KS "ZTdlMzlkZWNmZmQwNzg5ODk3ODMyNTFkM2M1ZTk5OGYyNzAzMjJiZXwxMDE7OzE0ODUzNjU4Mzg7MjsxNDg1Mjc5NDM4LjA3ODg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"