ASP.net Application Problem.

Hello everyone!
I have uploaded my site on a webserver. Some times it works fine but some
time it gives error "Null Object reference exception".
The same site on my local server works just fine.

When I change the "global.ascx" and ".dll" file in "bin" directory, it
starts working fine but after some time, same problem arises again :(.

Can any one help me plz in figuring out the problem, and I wud highly
appreciate your suggestions and recommendations.

Thanks in anticipation.
.

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