Teambuild not copying XAP fiesl to _PublishedWebsites

I have a TFS build for sivelright and it copies all the files in the web project to _PublishedWebsites, except the xap file. Error is

Web.csproj error MSB3021: Unable to copy file "Some.xap" to "c:\somewhere\Some.xap" Cou开发者_开发知识库ld not find file "Some.xap".

What it is trying to do, from where it is trying to copy and why it is failing?

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Make sure your projects are built in the right order in your TFS Build Definition (Build Definition, Process, Required, Project to Build).