I have found a cure for my problem. When I run the program locally, I needed to put this in my web.config.
<httpModules>
<add name="CuteWebUI.UploadModule" type="CuteWebUI.UploadModule,CuteWebUI.AjaxUploader"/>
</httpModules>
but when I published it to the actual server, I needed to put this in my web.config.
<modules>
<add name="CuteWebUI.UploadModule" type="CuteWebUI.UploadModule,CuteWebUI.AjaxUploader"/>
</modules>