Kaltura_Client_Exception thrown

Invalid KS "MGU2ODY4MmMwMDcxNDQxODBhZjE3YTIxNzRmZmMzMDA2ZjRiZTFjY3wxMDE7OzE1MDA3Mjg4NzE7MjsxNTAwNjQyNDcxLjk3MzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"