Compilation Error ASP.NET

Hi Experts,
When tried to compile my Web Application for troubleshooting, I got the following errors.  Please try to help.  Thank you very much in advance.

Warning      1      The element 'compilation' has invalid child element 'compilers'. List of possible elements expected: 'assemblies, buildProviders, codeSubDirectories, expressionBuilders'.      C:\Projects\XXX\Web.config
Error      2      Validation (XHTML 1.0 Transitional): Element 'html' is missing required attribute 'xmlns'.      C:\Projects\XXX\Pages\spellcheck.aspx      
Warning      3      Validation (XHTML 1.0 Transitional): Attribute 'name' is considered outdated. A newer construct is recommended.      C:\Projects\XXX\Pages\spellcheck.aspx
Warning      4      Validation (XHTML 1.0 Transitional): Attribute 'hidefocus' is not a valid attribute of element 'iframe'.      C:\Projects\XXX\Pages\spellcheck.aspx
Warning      5      Validation (XHTML 1.0 Transitional): Attribute 'name' is considered outdated. A newer construct is recommended.      C:\Projects\XXX\Pages\spellcheck.aspx
Error      6      Validation (XHTML 1.0 Transitional): The values permitted for this attribute do not include 'center'.      C:\Projects\XXX\Pages\spellcheck.aspx
Error      7      Validation (XHTML 1.0 Transitional): The values permitted for this attribute do not include 'middle'.      C:\Projects\XXX\Pages\spellcheck.aspx
RadhaKrishnaKiJayaAsked:
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Pratima PharandeCommented:
In 2.0, the <compilers> section is found in machine.config,
so you don't need to place it in web.config.

Check out machine.config.comments in the .Net Framework\config dir.

The syntax has changed.
It's now in the <system.codedom> section.

See : http://msdn2.microsoft.com/en-us/library/e4hwk57e.aspx

refer
http://www.velocityreviews.com/forums/t113519-the-element-compilation-has-invalid-child-element-compilers.html
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RadhaKrishnaKiJayaAuthor Commented:
Hi pratima_mcs,
Thank you very much for your help.  I followed the instructions and issued is fixed.  Thank you again.
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