| title | description | type | page_title | slug | tags | res_type |
|---|---|---|---|---|---|---|
Error Promise is undefined |
Error "Promise" is undefined |
troubleshooting |
Error Promise is undefined |
error-promise-is-undefined |
promise,viewer |
kb |
| Product | Progress® Telerik® Report Server |
| Operating System | Windows |
As of Telerik Reporting R2 2017, the Report Server and HTML5 Report Viewer require a browser supporting promises.
The error indicates that the used browser does not support promises. Please follow the HTML5 Viewer: Important Settings article which contains the requirements for promises.
Add a promise polyfill to the page, such as Polyfill.io.