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Home/ Questions/Q 792589
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Editorial Team
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Editorial Team
Asked: May 14, 20262026-05-14T22:00:59+00:00 2026-05-14T22:00:59+00:00

What is the cause of this error: RSClientController is undefined? It is associated with

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What is the cause of this error: “RSClientController is undefined”? It is associated with a ReportViewerWebControl displayed on a ASP.NET page.

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  1. Editorial Team
    Editorial Team
    2026-05-14T22:00:59+00:00Added an answer on May 14, 2026 at 10:00 pm

    The ReportViewerWebControl needs to be registered through the Handler Mappings in IIS.

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