Symptoms

The following appears in the atlassian-confluence.log:

org.apache.velocity.exception.ResourceNotFoundException: Unable to find resource '/templates/macros/navmap-mytheme.vm'
	at org.apache.velocity.runtime.resource.ResourceManagerImpl.loadResource(ResourceManagerImpl.java:501)
	at org.apache.velocity.runtime.resource.ResourceManagerImpl.getResource(ResourceManagerImpl.java:384)

Cause

If you are using a Navigation Map Macro with a theme, like:

{navmap:mylabel|theme=mytheme}

Confluence looks for pages with the label set to "mylabel" and locate the navmap-mytheme.vm file in WEB-INF/classes/templates/macros directory. If the vm file does not exist, Confluence will throw the above error saying that it is unable to find the file.

Such error usually happens due to a copy and paste of the macro from the documentation page when testing for the macro functionality. A user might be using the macro without knowing that it refers to a custom setting for navmap macro, which is defined in the vm file.

Resolution

Remove the reference to the file if you are not using a customised navmap macro.