ASP.NET program stopped working mysteriously

I hired a programmer to write code in ASP.NET. The code was working last week. Now when I run the code, I get an error:
The directory '/App_Code/' is not allowed because the application is precompiled.

The code is to process payments with SAGE PAY on a website. The server is now running Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1025

I removed the /app_code folder and received a different error:
The file '/payment.aspx' has not been pre-compiled, and cannot be requested.
 
I have tried to get in touch with the programmer, but he has not yet responded (he might still respond...)

WE are dealing with a program that used to work.

I understand bits of ASP.NET, but not a lot. I do not know if the programmer delivered to me a compiled program or not. I do see a program payment.aspx.cs which contains regular code.

Any suggestions to get this work would be most appreciated.
Lev SeltzerAsked:
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Ramkisan JagtapLead DeveloperCommented:
Restore/create  the app_code back to the location.  Make a backup and delete the precompiled.config file.
Check if it works then.
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Lev SeltzerAuthor Commented:
I have deleted the file "PrecompiledApp.config" and put back the app_code folder and I no longer get this error.

Thank you.
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