Error 32 An error occurred when merging assemblies

When this error occurs in Visual Studio while building a solution using WDP (Web deployment project):
(Error 32 An error occurred when merging assemblies: The relative virtual path ‘S3.0/global.asax’ is not allowed here. aspnet_merge 1 1 Mems_deploy.), here is what to do:

1. Check the bin folder in your application and you will find App_global.asax.compiled.
2. Delete this file
3. Rebuild your application.

The cause of this error is that the WDP consider that your solution is already build since it found this file in your bin folder.