Symptoms

When viewing a page in a space using the Documentation Theme, the left hand navigation does not appear:

The correct view should look like the following:

Cause

The Velocity Helper module is disabled in Documentation Theme plugin.

Diagnosis

To check this, go to Administration >> Plugins >> Show System Plugins >> Documentation Theme plugin >> Manage plugin modules >> Velocity Helper(velocityHelper).

Resolution

Enable the Velocity Helper :

1. Browse to Administration >> Plugins
2. If using a version with the Universal Plugin Manager (3.4 or later), select View System Plugins. Otherwise, the system plugins will already be visible.
3. Find the Documentation Theme Plugin. Select Manage Plugin Modules.
4. Enable the Velocity Helper module.