Kaltura_Client_Exception thrown

Invalid KS "YTc1YjljMmMyZmFmNDc3M2M0NDQ3NjFkN2E2ODk3NGQwYzgzNTQwNXwxMDE7OzE0NzUxNDU0NDc7MjsxNDc1MDU5MDQ3LjA1MDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"