The resource /rest/files/1.0/files/content/undefined, cannot be found message appear inside the Confluence Page Gadget in Jira
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Summary
Adding the Confluence Page gadget into Jira Dashboard results in "The resource /rest/files/1.0/files/content/undefined, cannot be found" message inside the Confluence Page Gadget. The content of the Confluence Page loaded correctly despite the message.

Environment
Jira Software version 8.11.0
Confluence Server or Data Center version 7.5.1
With or Without a Reverse Proxy
Diagnosis
Recreating the Applicaton Link between Jira and Confluence doesn't help to resolve the message.
Creating the Unproxied Application Link doesn't help to resolve the message.
Other Confluence Gadget (Activity Streams Gadget etc.) loaded correctly in Jira without the message.
Cause
The plugin modules inside the default Confluence System plugin below is disabled:
Confluence File Notifications
Confluence View File Macro
The disabled plugin modules are not listed in the result from the SQL query below:
1
select BANDANAVALUE from BANDANA where BANDANAKEY = 'plugin.manager.state.Map';
Solution
Navigate to Confluence General Configuration > Manage Apps > Choose System from the dropdown menu and reenabled the following plugins:
Confluence File Notifications
Confluence View File Macro
ℹ️Ensure that all the modules is enabled.
Navigate to Confluence General Configuration > Cache Management > Click on Flush All to flush the Confluence System Cache.
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