Kaltura_Client_Exception thrown

Invalid KS "M2U1ZjY4MWQwNTkxMTkzZmRkMzgyNGUzZDc1ZjRlYzhmZTA0MzQyZHwxMDE7OzE0OTMyMzkzMTI7MjsxNDkzMTUyOTEyLjgzMDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"