Kaltura_Client_Exception thrown

Invalid KS "OWYxNTdkZjU3MGFhZDRhMDlhNGYyYmY1ZTk0ODAxMTY1ZmQ5ZjlhZXwxMDE7OzE0NzUxMjE1NjQ7MjsxNDc1MDM1MTY0LjkzNDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"