Kaltura_Client_Exception thrown

Invalid KS "MzM1YTAzMzIwZDg2ZDQ5YzU4ZTY0ODBmNzQyZTdlZDRjOWZjYzg2YXwxMDE7OzE0OTg4MDA0ODA7MjsxNDk4NzE0MDgwLjEwMDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"