Kaltura_Client_Exception thrown

Invalid KS "ZmEyMzI3YjE1ZmU0NTRmNWVlYzE2MTg2MDA1MzNhZTBjNTE5MDAyNHwxMDE7OzE0NzQ5NzM2MzY7MjsxNDc0ODg3MjM2LjM2NzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"