Kaltura_Client_Exception thrown

Invalid KS "NmE2MWIyOTdiZDk0ODVhZWUyZWJmYzMwOGIwYjM4ZWEwOWI5MjUyOHwxMDE7OzE0NzUzMTA5NDM7MjsxNDc1MjI0NTQzLjQ3NTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"