Kaltura_Client_Exception thrown

Invalid KS "OGU4YmFjMWZjZjY0MDNmMWQ4YjU5Y2NkMmY1MDJjZmFhMWY3Y2NkMXwxMDE7OzE0ODEzMjg2NDQ7MjsxNDgxMjQyMjQ0LjQ5MTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"