Tag provider " not found

I might missing something but i’m trying to access metadata property in alarming expression of the tag, utilizing following expression.
tag({itemPath}+’.Documentation’)

Getting an error (in tag diagnostics) “Tag provider not found”.
Is there any solution on this.

Thank you in advanced.

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Double check in the project properties that your Default Tag provider(Under Project -> General) is selected. It usually is selected by default, but errors like this seem to show up when that is missing.

Thank you for replay.
tag provider connection is correct. I'm getting this error only for alarming expression.

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Any solution for this issue ?

One thing comes to mind here, the single quote looks wrong, perhaps its the forums fault, or it went via a word document.
Also wouldnt the {itemPath} have to be inside the single quotes for it to make a complete path?