I agree that restarting SplunkWeb should make the error go away. One word of general warning. I've found when writing custom modules, if you try and subclass any of the core Splunk modules besides from the base classes AbstractModule or DispatchingModule, SplunkWeb wont necessarily include the files in the right order. If it chooses to output your custom module code first and then the SingleValue module, things will break. The order it does choose is a little unpredictable from what I remember and varies from platform to platform and maybe even server to server. In the end I gave up and so Sideview Utils doesnt subclass from any modules except the two base classes. While we're on the topic, within the Sideview Utils app, I created the HTML module specifically to obsolete SingleValue. You might want to pull Sideview Utils down and check it out; it might already have everything you need. There's decent documentation about all the modules and the techniques, but it's all contained within views inside the app itself, so it's a little unintuitive; you have to download the app first and only then decide if you want to use it. Cheers. http://splunk-base.splunk.com/apps/22279/sideview-utils ... View more