Knight Online in-game warning messages: bag, merchant, upgrade, premium and skill messages
In-game item, merchant/trade, upgrade, premium/Genie and skill warnings in the game's own wording, with links to the related guides.
Knight Online
Errors and fixes
Knight Online and Knight Online on Steam errors: 10060, XIGNCODE3, Runtime Error, Invalid Data Tables, SteamKO -18 and error codes, and the game's own messages.
Knight Online login and connection error messages: the full list
The game's login, account, connection, launcher and security messages in their exact wording, with links to guides for errors that have a detailed fix.
SteamKO account blocks: the 2099-12-31 ban, Account Creation Abuse and On Hold explained
The three account blocks on the Steam version: the 2099-12-31 website ban, Account Creation Abuse on new accounts and On Hold after a chargeback, with the official route for each and how to avoid them.
Steam Knight Online not starting: closes after START, closes after patching, antivirus alerts
Startup symptoms of the Steam version in a table (cause and fix), why closing after a patch is normal according to NTTGame, a step-by-step fix, antivirus alerts, Steam Deck and a Windows 11 FPS note.
SteamKO error codes: what (0), -8, -18, -31, -95, -99 and 255 mean and how to fix them
The Steam version's login error codes in one table: exact message, meaning and fix; the -8 block, -95 VPN, -99 Steam info, server-side (0) and (255), and a second account on the same network.
SteamKO phone authentication: SMS code not arriving, computer blocked (-16-9) and -6-3-1
The steps of the Steam version's mandatory phone authentication, the 10-minute code and 3-try rule, verification error messages, foreign number problems and how it differs from OTP on the Turkish servers.
SteamKO error -18: New connection detected, how to verify your Steam Knight Online account
What the -18 warning means and a step-by-step connection check with NTTGame's own screens: Steam login, GAME SERVICE, captcha and email code, and what to do if no code comes.
Knight Online Bug Report crash: Sorry. Unexpected error has occurred
What the Bug Report window means, common crash causes (laptop integrated GPU, DX11, drivers) with a step-by-step fix, and crashes without a report window.
Knight Online undefined error: can't create an account, invalid email and sign-up problems
Safe steps players say fix the undefined warning at sign-up, the 3-accounts-per-number ICS rule, email and username errors, and account creation on the Steam version.
Knight Online Invalid Data Tables error: Archive open failed, data tbl errors and patch problems
The game's file and patch error messages word for word with their meaning, repair steps for Invalid Data Tables, a network tip for Archive open failed and central directory errors, and a launcher stuck on Checking version.
Knight Online Runtime Error: Microsoft Visual C++, missing DLL and Sound Device Fail fixes
Causes of Runtime Error with a step-by-step fix, which Microsoft package to install for missing DLL errors, crashes the Steam version patched, and the Sound Device Fail error.
Knight Online XIGNCODE3 error: 0xE019100B, suspicious program detected and XIGNCODE not loading
What the XIGNCODE3 codes mean and NTTGame's official fix (delete xmag.xem, restart, ticket with logs), network steps when it won't load, virtual machines, AppSign/Security errors and mass-error days.