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"Error signing: key is not valid for use in the specified state" when compiling the Outlook 2010 add-in

I am creating an Outlook 2010 add-in that will be tied to our ticketing system using the ticket API. A week ago, I was able to compile and get context / ribbon menus that correctly performed their functions. This morning I added some functions for encrypting and decrypting the API key, but now when I try to compile, I get

"Error 1 An error occurred while signing: The key is not valid for use in the specified state."

There is no line or file number associated with the error. At first, I thought it was something with the System.Security class, which I included, but commenting on everything related to this, and removing the link to System.Security does not fix the problem.

I tried to restart everything and make a clean build with no luck. About the board, this forum post I tried to delete both my machines and local RSA files, but it did not matter. I also tried deleting the _TemporaryKey.pfx file in my solution in the hope that if he had problems that VS was recreated by a new worker, but that did not even change the error message to inform me that the file was missing.

After all this, I tried to open another add-in project, which I did not change for about a week, and it also had the same error. At the moment, I'm not sure if this is a problem with Visual Studio or my computer, but the new Outlook add-in project will compile successfully, so that it only affects older projects.

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2 answers

Creating a new test certificate seems to have solved the problem. This blog post pointed me in the right direction.

  • Open the properties page for the project that reports the error.
  • Click the Signature tab.
  • Click Create Test Certificate.
  • Enter your password and click OK.

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