Hi,
All of the sudden when I try to installa seasoned ClickOnce application, I'm getting the error shown below. I don't know if it's saying this is a requirement of the application (which it shouldn't be since this is a .NET 2.0 application) or of ClickOnce itself. Can anyone shed some light on this?

Unable to install or run the application. The application requires that assembly system.web.abstractions version 3.5.0.0 be installed in the global assembly cache (gac) first. Please contact your system administrator.

Thanks for your response. I'm in VS 2005 which I guess doesn't have a target framework option and doesn't seem to be "smart" enough to limit the referenced assemblies to .net 2.0.

The problem was that during development, I somehow added a new web custom control or something like that instead of a new class. That added references to System.Design, System.Web, System.Web.Extensions and System.Web.Extensions.Design. I deleted the file immediately but the references remained there w/out me knowing they were added.

The strange part is that even with these references I didn't have a reference to System.Web.Abstractions in my application manifest after building (which makes sense because I don't even have the assembly). That reference showed up when another developer built and published the application. After removing the references that I accidently added, he built the project and the reference to System.Web.Abstractions was also gone so I guess it was a dependency of one of the other assemblies.

Have you added any assemblies or files to your deployment since you last released it? You need to check the list of files in your publish folder against the last version to make absolutely certain.

Did you add any projects to your solution since you last released it? Can you double-check the target framework in the Application tab and make sure it's .Net 2.0?7

RobinDotNet

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Thanks for your response. I'm in VS 2005 which I guess doesn't have a target framework option and doesn't seem to be "smart" enough to limit the referenced assemblies to .net 2.0.

The problem was that during development, I somehow added a new web custom control or something like that instead of a new class. That added references to System.Design, System.Web, System.Web.Extensions and System.Web.Extensions.Design. I deleted the file immediately but the references remained there w/out me knowing they were added.

The strange part is that even with these references I didn't have a reference to System.Web.Abstractions in my application manifest after building (which makes sense because I don't even have the assembly). That reference showed up when another developer built and published the application. After removing the references that I accidently added, he built the project and the reference to System.Web.Abstractions was also gone so I guess it was a dependency of one of the other assemblies.