Kaltura_Client_Exception thrown

Invalid KS "ZTY4OTkyN2RkZGFjNzE0ODQ1MjdhMWVjZTJlNzExMzQ0YTM4ZWYzNHwxMDE7OzE0OTM0MjU3MzY7MjsxNDkzMzM5MzM2LjkzNDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"