TypeError Cannot read properties of undefined (reading 'wrapper') in HTML5-based report viewers

Environment

Product	Reporting
Version	19.2.25.1001

When initializing the HTML5 Report Viewer, a TypeError: Cannot read properties of undefined (reading 'wrapper') error appears in the browser console, preventing the report viewer from loading properly.

Cause

This error occurs when a Sass-based Kendo UI theme is missing from the page. The report viewer requires proper Kendo UI styling to initialize correctly.

Solution

Include a valid Kendo UI theme in your page by adding a CSS reference such as:

<link rel="stylesheet" href="https://kendo.cdn.telerik.com/themes/10.2.0/default/default-ocean-blue.css" />

For more information about available themes, see Telerik and Kendo UI Themes Introduction.

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