Why does this Albacore msbuild task fail to copy this web project assembly?

We're using Rake with Albacore for our build and deploy process in TeamCity. But, my latest solution has problems when compiling. When I run the msbuild task, I get this error:

C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v9.0\WebApplications\Microsoft.Web开发者_运维知识库Application.targets(60,3): error MSB3021: Unable to copy file "bin\admin.web.dll" to "C:/src/Trunk/admin/output/_PublishedWebsites\web\bin\admin.web.dll". Could not find file 'bin\admin.web. dll'.

The build output path for the website project is set to bin\. And it copies fine when built in Visual Studio. But, building through Rake doesn't work. My compilation ruby file has the :outdir set to 'output/_PublishedWebsites' and it copies fine for all my other solutions.

It's an edge case but it's causing me pain - anybody got any ideas?

Thanks for everyone's help but it isn't anything specific to the msbuild task. The solution had 3 web projects in it & one of them had the bin directory included in the solution in VS. All I needed to do was exclude from the solution & the build & publish works fine - no more locking.

whats the full msbuild command that gets executed?

Edit pretty sure its a path issue. I use

/p:WebProjectOutputDir: /output
/p:OutDir: /output/bin

If you post the ms build command, or at least the albacore config it would be much easier to help ;)

What project are you building? what dependencies does it have?