Error code

Riot Error Code 002

RIOTError Code 002
Game/Platform Error· An error code shown by a game or gaming platform/launcher.

What it means

The League client failed to patch and you cannot log in.

How to fix it

  1. Free up disk space on your drive.
  2. temporarily disable your antivirus to rule out a false-positive.
  3. run the Hextech Repair Tool.
  4. restart the client.

Not affiliated with Riot. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.