Kaltura_Client_Exception thrown

Invalid KS "YTZhYzFhNzQ5MDM1ZGZlY2E3NGVmYWMyMDc0MGQxNjBkZTA0ZWI1MnwxMDE7OzE0NzUwOTAwOTc7MjsxNDc1MDAzNjk3LjAxNjU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"