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Could not load file or assembly ‘Microsoft.SharePoint.ApplicationPages, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c’ or one of its dependencies

Posted on: March 29, 2015

After a SharePoint migration this error can occur if you forget the final step

stsadm -o copyappbincontent

Some of your custom solutions may depend on it because of some user controls or pages

No need to change the web.config for that

And last but not least to ensure you have access to your site check the site collection administrators in the Central Admin

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