So, I was planning to buy energy from the supply depot, but for some reason the gave me this error message...

"m.billing_steam_error.3"

I tried re-installing it, still not working.
Also I tried verifying the game cache, it says 10 files failed to be retrieved.
So I tried downloading it again. After i launched the game, still has errors.
Verifying the game cache again... still 10 files failed to be retrieved.

Is there ANYWAY to fix this? I really need to know.
If there wasn't, is there any alternate ways to purchase energy?
THANK YOU