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FAQ and troubleshooting ​

Scripts ​

My script doesn't run ​

  • Where is it? A Script doesn't run in StorageService or UI; a ClientScript doesn't run in ServerService or StorageService. KHIM Engine dims a script that won't run where it is - hover it for why.
  • Is there an error? Open the Console (Ctrl J) during a test; errors are red, and clicking one opens the line. The Problems tab lists every script's errors at once.
  • Does it wait for something that never comes? waitFor("Name") warns after 5 seconds when nothing by that name appears - check the spelling, capitals included.

"attempt to index nil with ..." ​

What came before the dot is nil: the object isn't there (yet), or its name is spelt differently. In a ClientScript the world arrives a piece at a time - use waitFor:

lua
local door = world:waitFor("Door")

"... is not a valid member of Part; did you mean ...?" ​

A misspelt member. KHIM's members are camelCase: position, not Position... though Roblox's Position works too. Follow the "did you mean".

My ClientScript's change only shows for me ​

That's how it works: a ClientScript's change to a part stays on that player's screen. Make changes that matter in a server Script, and have the ClientScript ask with net.send. See Server and client.

My server Script changes a Light / Decal / Billboard, and players don't see it ​

The looks on parts are each player's own after they join: change them from a ClientScript (the server can tell clients to with net.sendAll). See Sounds, lights and effects.

My ClientScript works in the test but not for players ​

A ClientScript or Module over 64 KB of text never reaches players. Split it into Modules, each under 64 KB.

A script stops with an error about running too long ​

A loop without a wait. Add task.wait() inside every while true do.

My data isn't saved ​

  • Guests (userId -1) are never saved - test signed in.
  • Wrap get and set in pcall and print the error.
  • Save in players.left, and read what you need before any task.wait there.
  • See Saving data.

Building ​

My part falls when I press Play ​

It isn't Anchored. Tick Anchored in the Inspector's Behavior section.

Players walk through my part ​

CanCollide is off, or its collision group doesn't collide with Players. View > Collisions outlines everything players walk through.

My imported model is the wrong size, or lying on its back ​

In the import window: Studs a unit (1 for Blender), Up is (Z for models exported Z-up), Turned. If it is inside out, tick Turn faces over.

Players fall through my MeshPart building ​

A MeshPart collides as its box. Put invisible anchored parts where the floors and walls are.

My uploaded picture or sound doesn't show for players ​

It is waiting for a moderator (an amber ring on its card in the Assets panel). You see it in KHIM Engine meanwhile; players get it once it is approved. Rejected ones say why in the tooltip.

Going live ​

Go live is greyed out or fails ​

  • Sign in (Home > Sign in with browser).
  • A game name is 3 to 60 characters.
  • A world is 16 MB and 10,000 parts at most.
  • An imported .rbxl world needs the "I made this place" box ticked.

Players still get the old version ​

Servers already running keep their version until they empty. Shut them down from the Workshop's Live page to move everyone over.

My game isn't in the lists ​

New games start private. Set Visibility to public in the Workshop > the world > Settings.

Performance ​

The game lags ​

  • Settings > Graphics quality: leave it on Automatic, or lower it. Level 1-2 suit weak phones.
  • F3 shows frames a second and draw calls; Shift+F5 shows physics, rendering and network times.
  • In KHIM Engine, F3 during a test names the busiest scripts.
  • Fewer, bigger parts draw faster than many small ones; Smooth suits big flat surfaces.
  • A huge world: set world.streamingRadius so players get only what is near them.

The world is blank, only the HUD shows ​

Usually an old graphics driver: update it from your graphics card maker's website. KHIM needs OpenGL 3.3 (Intel HD 4000, AMD Radeon HD 5000, NVIDIA GeForce 400 and later).

Logs ​

When something goes wrong, these files say why:

Windows
The KHIM app%LOCALAPPDATA%\KHIM\runtime\client\client_log.txt and client_error_log.txt
KHIM Engine%LOCALAPPDATA%\KHIM Studio\runtime\studio\studio_log.txt (and studio_log.old.txt for the run before, where a crash's report is)

Send them with a bug report.

Still stuck? ​

Use the search (Ctrl K) - it finds Vietnamese without its marks too. Or ask on khim.net.