Problems with using User-Extension file in Selenium RC

I am trying to test some web applications with Selenium RC. My company uses IE, so IDE is not the best option. I have set up Selenium RC and have run successful scripts from the command without using my user extension file. I was hoping to use some of the custom functions I created in my user-extensions.js file. When I run the script from the command I get an IE Script Error saying 'testCase' is undefined.

I am running this:

java -jar selenium-server-standalone-2.15.0.jar -userExtensions "user-extension filepath" -htmlSuite "*iexplore" "my url" "test suite filepath" "results filepath"

Anyone else have this problem, or know if it is actually possible to run this from the command? Any advice would be great!

I answered my own question and got it to work. If anyone cares to know, I was using the custom while statement that I found online in my user-extension file. There is a testCase object that is not defined(hence the error). When I commented that out, the script ran fine.