This.controller is null or not an object reportviewer / Report Viewer Control missing Header Icons

In order to fix the above issue open IIS manager , double click the website for which you are facing the issue , double click handler mappings , click Add managed Handler . In the dialog box which appears

Request path: Reserved.ReportViewerWebControl.axd
Type: Microsoft.Reporting.WebForms.HttpHandler
Name: Reserved-ReportViewerWebControl-axd

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