Sunday, 15 May 2011

.net - ClickOnce Install Error: Unable to install this application because an application with the same identity is already installed -


I see the following error message when I try to install my application using clickon.

Unable to install this application because an application has already been installed with the same identification. To install this application, either modify the manifest version for this application or uninstall an existing application.

I get this error only when I am trying to install a production version and I have the QA version installed with the same version number. I use a different product name for two environments, so I do not know why there will be a conflict.

Now, for the really funny part, if I take a copy of the directory that is hosting the application, and runs the exact same set of commands, except for this time the name of the parameter Use "QA2" for, I can install the second copy of the application. One is called QA and the second is QA2. Everything about them is similar, but still, I still can not install a production version that has a completely different name. What should I do to avoid this error?


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