Upgrading from 9.0 to 10.1 - Global.asax error

I am getting this error on initial load after an attempted upgrade.  Is there anything obvious that could be causing this?

Parents
  • Is it a clean site?  As in the web files are completely OOTB?   No custom dlls, didn't copy over dlls, etc?

    Any use of non-supported code?   If you used any non-supported Apis in 9 and carried them to 10, there is a good chance its not going to work at all because the dlls, namespaces classes all changed and the only thing that was left with backwards compatibility would be supported Apis.

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  • Is it a clean site?  As in the web files are completely OOTB?   No custom dlls, didn't copy over dlls, etc?

    Any use of non-supported code?   If you used any non-supported Apis in 9 and carried them to 10, there is a good chance its not going to work at all because the dlls, namespaces classes all changed and the only thing that was left with backwards compatibility would be supported Apis.

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