I'm doing some research on that atm. Seen it before, don't know what it's about.
In the meantime, could you check if there's a file called TS3_1.38.151.0180xx_update.exe or http://akamai.cdn.ea.com/eadownloads/u/f/sims/sims3/patches/TS3_1.38.151.0180xx_update.ex_ anywhere on your computer ? If you do, that's the patch so you won't need to worry about having to re-download the patch at all.
For next time, I would download the manual patch instead of the one through the launcher. This way you can save the patch to a safe location and don't need to worry about your internet allowance.
EDIT: Can't seem to find anything useful on this error.
Could you post a screen shot of the error ? Did you update WA as well or just the base game ? Do you have both games as disk versions and do you have any other EP/SPs ? Are you using custom content or mods ?