Sounds like you're playing the old version of User Error, before the remaining missions were made. After you completed Uplink, it would try to load the next level . . . but there weren't any more.
You need to replace the old version with the new one. There's a forum topic about the new version, right here on Tron-Sector. You'll find a link there to download it.
You can keep your saved games from the old version. They should work fine, in order to get you from Uplink to Infested Spacejunk without having to start over.
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