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Report viewer web part is not loading data in report viewer. Here is the error I found in browser console:

"Sys.ArgumentNullException: Value cannot be null. Parameter name: id"

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  • does it work fine in powerbi service what all components are included in the report is there any custom component used ex. from 3rd party appsource? Commented Aug 21, 2020 at 16:20
  • It works fine in ReportServer Browser i have not used any custom component Commented Aug 22, 2020 at 9:44

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Change a browser to check if the issue still exists.

Turn off the debug mode in the Web.config file of the SharePoint site then compare the result:

<compilation batch="false" debug="false">

In addition, Report Viewer web part cannot be used on modern pages within SharePoint.

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