Kaltura_Client_Exception thrown

Invalid KS "MDJjYWE0OGZkOTdiYWI3MGJjOGFkZGEyMDlhNjUyNWQ1MjNhZGUyYXwxMDE7OzE0NzQ4NDUwMzY7MjsxNDc0NzU4NjM2LjU3Mjk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"