Kaltura_Client_Exception thrown

Invalid KS "OWY4YTJhYjQ4ZjkxMWFhNTZkY2RjZTY2ODIzYmQ4MDA5MDFkYWI1MXwxMDE7OzE0ODEyNTAwNTg7MjsxNDgxMTYzNjU4LjA5Nzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"