Hi,

I have upgraded successfully from v7.5.7 to v7.7.8 using Visual Studio package console and the application runs fine locally and also if I use Web Deploy to push to Azure.

However, we usually deploy using TeamCity and even though the build completes without any errors, the Azure web app is broken and I get this error with Custom errors turned off:

Could not load type 'umbraco.interfaces.IDiscoverable' from assembly 'interfaces, Version=1.0.6219.11988, Culture=neutral, PublicKeyToken=null'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.TypeLoadException: Could not load type 'umbraco.interfaces.IDiscoverable' from assembly 'interfaces, Version=1.0.6219.11988, Culture=neutral, PublicKeyToken=null'.

If I activate Azure log streaming, I see this message:

 - IIS received the request; however, an internal error occurred during
   the processing of the request. The root cause of this error depends
   on which module handles the request and what was happening in the
   worker process when this error occurred. 

 - IIS was not able to access
   the web.config file for the Web site or application. This can occur
   if the NTFS permissions are set incorrectly.     
 - IIS was not able to
   process configuration for the Web site or application.The
   authenticated user does not have permission to use this DLL. 
 - The
   request is mapped to a managed handler but the .NET Extensibility
   Feature is not installed.

Like I say, this only happens when deploying through Teamcity so I'm confused to say the least.