Could not load file or assembly ‘Microsoft.SharePoint.ApplicationPages, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c’ or one of its dependencies
Posted March 29, 2015
on: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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