Kaltura_Client_Exception thrown

Invalid KS "MjdkNTdiMjQ2ODJmNjZkZjhjNmI1ZjUzZjBiZDg3YjI4NzhkMDk3Y3wxMDE7OzE0OTA5MDIyMDU7MjsxNDkwODE1ODA1LjEyMTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"