Solved: “An error occurred while signing: SignTool.exe not found”

This issue may come up when you try to publish your project in Visual Studio:

An error occurred while signing: SignTool.exe not found

Solution

The main cause is that you are missing ClickOnce Publishing Tools component in your Visual Studio installation. Simply follow these steps to solve this issue:

1. Go to “Add/Remove Programs”
2. Find “Visual Studio”. Click “Change”
3. Select “Click Once Publishing Tools”
   
4. Click “Next” and then click “Update”

Credits: http://stackoverflow.com/questions/7548342/an-error-occurred-while-signing-signtool-exe-not-found