Kaltura_Client_Exception thrown

Invalid KS "M2I1MTM3ZGM5OTdhNzRlMjA1MThjMjk2MDNjYWI1NDkwYTMwNzAwNHwxMDE7OzE0NzI0NDg3ODk7MjsxNDcyMzYyMzg5LjkzMzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"