the user interface in Splunk 4 is divided up into lots of individual modules. TimeRangePicker is the pulldown menu that you see to the right of the search bar. What this error is indicating is that the browser ended up with a corrupted version of the file.
It is possible that the file on disk has gotten mangled somehow. However if you're using Firefox, another possibility is that you've hit a strange and quite rare bug that we've been trying to figure out. It really looks like a bug in firefox itself but we're still looking into it. At any rate the browser ends up with a truncated version of one or more files. When that file is a javascript file, it will throw a syntax error in the Javascript interpreter, and then later on the Splunk Interface will complain that something is missing like this.
If you are using firefox, check Tools > Error Console, and then select 'Errors'. I'll bet you'll see a a syntax error of some kind in TimeRangePicker.js.
Once you hit it, the partial version will get cached for a long time, so clear your cache to fix it. (Ctrl-Refresh, or Tools > Clear Private Data)
