Configuration File Errors in IIS7

Hi expert, the configuration file is running fine in IIS5, but recenlty I ran it in IIS7, and it didn't work. How to fix the configuration file? Appreciate it!
<?xml version="1.0" encoding="utf-8" ?> <configuration>        <system.web>     <!--  DYNAMIC DEBUG COMPILATION           Set compilation debug="true" to insert debugging symbols (.pdb information)           into the compiled page. Because this creates a larger file that executes           more slowly, you should set this value to true only when debugging and to           false at all other times. For more information, refer to the documentation about   & ...