Once Human error codes and crash fixes
Every error, crash and connection failure we have a fix for, one page per code. Before the fix, each page says whether the problem is your machine or the studio's servers — because if it's theirs, no amount of verifying game files will help, and the only useful answer is whether it's happening right now.
Things you can fix
Crashes, install faults and driver conflicts. Find your symptom, work the steps in order, stop when it launches.
None logged yet — check back as reports come in.
Things you cannot
Queues, capacity limits and login failures. These are server-side — every page below links back to live status rather than a fix you can perform yourself.
Once Human error code 124: login stuck, then fails (fix)
The login screen hangs for an extended period — one report describes roughly 20 attempts over a few hours — before finally showing an "Error code 124" message instead of letting the player in.
Once Human error code 409: gear repair fails (fix)
Trying to repair a weapon or piece of gear fails outright with an "error code 409" message instead of completing the repair.
Once Human error code 120: can't enter scenario (fix)
Selecting and trying to enter a new scenario (a time-limited game mode server) fails with an "error code 120" message and blocks entry.
Once Human error code 116: Eternaland login failed (fix)
Clicking to enter Eternaland (the game's base-building hub) returns "Login failed, Error code 116" instead of loading in.
Once Human "Server Request Timeout": what it means (fix)
Trying to log into a server, or reconnect mid-session, returns a "Server Request Timeout" message instead of loading the character in.
Once Human "Server Is Full": what it means, how to get in (fix)
Trying to create a character on, or join a friend's, server returns a "Server is Full" message — sometimes even when that same server's population meter shows "Low."
How these are graded
Every fix step carries a label. Confirmed means players demonstrably got back in with it, or the studio said so directly.Reported means it worked for some people and not others. Unconfirmed means it's circulating and there's no evidence either way yet. The distinction is the point — a page that lists five fixes with equal confidence costs you an evening.