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unknown build error RRS feed

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  • unknown build error 'an item with the same key has already been added'.

    I got the error above shortly after I added a Listbox control and a couple listbox items. The strange thing is I was able to run my project before this error prevented me from building. I noticed that all the font styles had all changed randomly, then I got this error and have been unable to build since.

    I immediately undid the work, but the error remains and prevents me from building.  : (

    Along with the error, the complier refers me to the following file which is not even in my reference folder:

    Microsoft.Silverlight.Common.targets

    This is a Silverlight app btw. Any help is appreciated.

    Wednesday, February 13, 2013 4:26 PM

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