Kaltura_Client_Exception thrown

Invalid KS "M2QwNmQyYTMwM2I0ZWU0MTczMGNhNWVjOWRiM2NlZDQ1OTk2NjIxNnwxMDE7OzE0OTA3NDgzMjM7MjsxNDkwNjYxOTIzLjA4NDE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"