CI App working locally but not on my server?

[eluser]mck9235[/eluser]
I was working on a CI application on my own machine that was running perfectly. I then tried uploading it to my webserver and I keep getting a message saying that it's not able to locate my two custom models, which work fine on my local machine. I checked and all the paths are defined properly and the model files are definitely there. (It's PHP 5 on the local machine, 4 on the server).

Any insight would be greatly appreciated!