[Opensource] problem-upgrad expresso 402 to 502

[Xun Li]

Hello everybody

I just upgrad my applications from expresso402 to expresso502. after
chang some table such as userstable, userroles,etc.
my applications looks working, but when I do register new user, check
user information, usergroup operations, expresso give me error message,
report could not find virtual field "LoginName". 

I hope this bug be fixed, please tell me how to solve this problem.
urgent!!!

thanks