Kaltura_Client_Exception thrown

Invalid KS "YjQ0M2Y5NjM1ZTFlZDhhOGMwNWVmMTc3YzRkZmMxN2RjNjM3Njc4Y3wxMDE7OzE0NzUzODUyMjk7MjsxNDc1Mjk4ODI5LjM4Mzc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"