在将varchar值'12B91973-364D-9FC7-680470D88874'变换为数据类型int时失败

SELECT     A.username, A.fullname, A.password, A.userid, A.email, A.telephone, A.mobilephone, A.mphone, A.fax, A.worked_time, A.fee_center, A.reg_num, A.titleofpost, 
                      A.isenable, A.isadmin, A.memo, A.mailsize, A.conf_password, A.guid, A.img, CASE ison WHEN 1 THEN '在岗' ELSE '离岗' END AS isonmc, A.ison, A.orderid, 
                      dbo.EF_GETMNG(A.username) AS 主管, B.org
FROM         dbo.sys_user AS A LEFT OUTER JOIN
                      dbo.sys_orgmenber AS B ON A.username = B.member
UNION
SELECT     bm, cjr, cjrbm, cjrgw, cz, dw, fjh, qq, qyyx, sjdh, txdz, wb, wbyx, xm, yb, yddh, zjh, zy, sslb, gstxl, wldwtxl, guid, ' ' AS Expr1, ' ' AS Expr2, ' ' AS Expr3
FROM         dbo.txl