KB-1587 Tempo and /designer contents do not render properly

Symptoms

Tempo is not rendering properly:

When trying to access /designer, this error can appear:

Cause

This can happen when the Default Community has been deleted.

Action

Check if the Default Community exists:

1. Navigate to Runtime Data (<APPIAN_URL>/suite/designer).
2. Click on Documents.
3. Check if the Default Community is present. The following two subfolders should also be present: System Knowledge Center and Temporary Documents Knowledge Center.

If it is not present, here is how to recreate the Default Community:

1. In an environment where the Default Community exists running the same version and hotfix as the malfunctioning environment, open Appian Designer.
2. Create an application containing the Default Community, System Knowledge Center, and Temporary Documents Knowledge Center.
3. Export this application from the working environment and import it into the malfunctioning environment.

This community has a reserved UUID which means that importing it will restore it.

Affected Versions

This article applies to Appian 17.4 and earlier.