General error acces in "User Import Tool"

Hi,

I have a general error acces in the SolarWinds "User Import Tool" program.

I used it one hour ago with a server 2003 without problem but now on a server 2008 I get this error :

I have all the rights on this server so I can't understand this error.

If you know what's wrong, I'd be happy to have your help.

Thanks,

Sub