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"@microsoft/sp-http" that is not declared in the manifest

 Hi,

I was trying to use SPFx PnP Property Pane Controls. Specially PropertyFieldSitePicker control. When I have given reference & used it in Property configuration pane, It has given an error :

Something went wrong

If the problem persists, contact the site administrator and give them the information in Technical Details.

Solution is very simple just use "gulp clean".

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