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| 1 | +--- |
| 2 | +title: Errors when Office add-ins start |
| 3 | +description: Provides information about errors that might occur when Office add-ins start. |
| 4 | +author: Cloud-Writer |
| 5 | +ms.author: meerak |
| 6 | +manager: dcscontentpm |
| 7 | +audience: ITPro |
| 8 | +ms.topic: troubleshooting |
| 9 | +ms.reviewer: rickki |
| 10 | +ms.custom: |
| 11 | + - sap:Microsoft 365 Apps for enterprise\Add-Ins\Add-Ins from AppSource/Sideloading/Network Share/EXO Admin/SharePoint Catalog |
| 12 | + - CSSTroubleshoot |
| 13 | + - CI 7885 |
| 14 | +search.appverid: |
| 15 | + - MET150 |
| 16 | +appliesto: |
| 17 | + - Microsoft 365 Apps |
| 18 | +ms.date: 12/13/2025 |
| 19 | +--- |
| 20 | + |
| 21 | +# Errors when Office add-ins start |
| 22 | + |
| 23 | +## Summary |
| 24 | + |
| 25 | +This article provides information about errors that you might see when an Office add-in starts. |
| 26 | + |
| 27 | +## Errors generated by Office |
| 28 | + |
| 29 | +When Microsoft Office tries to start an Office add-in that uses a task pane, an error occurs, and the add-in doesn't start. In this situation, Office displays an error message in an information bar at the top of the task pane, as shown in the following screenshot. |
| 30 | + |
| 31 | +:::image type="content" source="media/errors-when-office-add-ins-start/office-add-in-information-bar.png" alt-text="Screenshot of the information bar displayed at the top of the task pane."::: |
| 32 | + |
| 33 | +> [!IMPORTANT] |
| 34 | +> This kind of error is generated by Office, not by the add-in. Unless the error message explicitly states otherwise, you shouldn't contact the add-in provider. Contact your Microsoft 365 administrator instead. |
| 35 | +
|
| 36 | +The following table lists the most common error messages that cause users to mistakenly contact the add-in provider. |
| 37 | + |
| 38 | +| Error text | Explanation | |
| 39 | +|---|---| |
| 40 | +|This Add-in uses features not supported by its add-in catalog.|For more information about this error, see [Deploy and publish Office Add-ins](/office/dev/add-ins/publish/publish#additional-publication-methods-for-the-add-in-only-manifest).| |
| 41 | +|We can't load this Add-in because its source catalog is not supported on your device.|For more information about this error, see [Deploy and publish Office Add-ins](/office/dev/add-ins/publish/publish#additional-publication-methods-for-the-add-in-only-manifest).| |
| 42 | +|Add-ins are disabled in this version of Word, Excel, and PowerPoint. Buy Microsoft 365 to enable add-ins.|You opened an Office document and add-in in a nonsubscription or reduced functionality version of Office, but the add-in uses Office features that aren't supported in this version.| |
| 43 | +|Office 365 has been configured to prevent individual acquisition and execution of Office Store Add-ins. <br/><br/>Microsoft 365 has been configured to prevent individual acquisition and execution of Office Store Add-ins.<br/><br/>Office 365 has been configured to prevent individual acquisition and execution of Add-ins from Microsoft AppSource.<br/><br/>Microsoft 365 has been configured to prevent individual acquisition and execution of Add-ins from Microsoft AppSource.<br/><br/>Office 365 has been configured to prevent individual acquisition and execution of add-ins.<br/><br/>Microsoft 365 has been configured to prevent individual acquisition and execution of add-ins.|These error messages are all versions of the same error message. In addition to the situation that is mentioned in the error text, this message is displayed in the following situation:<br/><br/>If you install an add-in to a document, and another user who doesn't have permissions to that add-in, then opens the document, the other user receives this error message.| |
| 44 | +|We can't start this add-in because it isn't set up properly.|For more information about this error, see [Deploy and publish Office Add-ins](/office/dev/add-ins/publish/publish#additional-publication-methods-for-the-add-in-only-manifest).| |
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