One of Visual Studio’s most cryptic error messages is Server Explorer’s infamous “the given key was not present in the dictionary.” This typically means that you’ve installed a custom data provider, created a Server Explorer connection using that provider, and then uninstalled the provider without deleting the Server Explorer entry. This pretty much kills Server Explorer: from now on, any time you try to add or remove a connection, it barfs up the useless error. This means you can’t even remove the dud connection.
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