Clickonce deployment error

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IIS6

IIS

ClickOnce

We are deploying a winforms application tru click once. Everything went well upto last update. In the latest update, we go the following error.

abc.dll, has a different computed hash than specified in manifest.

Searched in net and come to know that mage.exe has to be used to resolve this issue.
Can any one explain how to use this tool step by step.
Because we find difficulties in using this.

Thanks in advance.