we used to have plugin "Confluence usage stats" (Confluence Usage Tracking Plugin) in confluence working OK, last week the unix server has problem and confluence was restarted, then users got the following error when use this plugin. Also UPM (Plugin manager) on Admin screen showed it in the list of User-Installed Plugins which I think this should be in the system plugins list. Anyone knows what went wrong? Thanks
-----error---------
org.apache.velocity.exception.ResourceNotFoundException: Unable to find resource '/templates/usage/global-report.vm'
at com.atlassian.confluence.util.velocity.ConfigurableResourceManager.loadResource(ConfigurableResourceManager.java:400)
at com.atlassian.confluence.util.velocity.ConfigurableResourceManager.getResource(ConfigurableResourceManager.java:304)
at org.apache.velocity.runtime.RuntimeInstance.getTemplate(RuntimeInstance.java:1400)