Kaltura_Client_Exception thrown

Invalid KS "NGRkMDkxMTgwMTllMDg2MTZmOTVjYWY2NWI4Y2FiZDA0YmYxNjRiM3wxMDE7OzE0OTMzNTEyMDM7MjsxNDkzMjY0ODAzLjQ1NDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"