求助! 在pb中出现这个错误

在pb中出现错误:coo19:incompatible property log for type transaction
具体代码是if sle_1.text="" then
    messagebox("payattention!","the user name can't be null")
    sle_1.setfocus()
elseif sle_2.text="" then
    messagebox("payattention!","the password can't be null")
    sle_2.setfocus()
else
    SQLCA.Log.ID=sle_1.text
    SQLCA.Log.Pass=sle_2.text
    connect;
   if SQLCA.sqlcode<>0 then
      messagebox("数据库连接失败!",SQLCA.salerrtext,stopsign!)
      halt
   end if
   open(w_main)
   close(w_login)
end if
不知哪里出现错误,请各位高用帮帮忙!