"SignFile" task error when publishing

(Remark: I would like answers only from experienced experts and not instant google search)

In order to check my winform app. install proc. when no Framework installed  I removed  Framework installation using dotnetfx_cleanup_tool.
After that I reinstall Framework 3.5 I can build the project but got an error when trying to deploy.
The error that I got is:
Error 3 The "SignFile" task was not given a value for the required parameter "CertificateThumbprint".
What can I do to solve this problem or to reset this parameter?
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1) Double click the My Project node in your project.
2) Click on the Signing tab.
3) Make sure "Sign the ClickOnce manifests" is checked.
4) Click the "Select from File..." button, and select the *.pfx file in your project.

This happened to me awhile back

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