Problem on real hosting

i have a real problem with my website

i have upload my database backup on the real host and start my website from the local host it act very good

after uploading the webSite the following error appaer

Runtime Error

<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>

i 've follow the instrictionand tern customErrors mode to the status "Off" but the same error still stand what can i do

please help me

[563 byte] By [EngSaQeR] at [2007-12-23]