I work on a project wich uses a 3d world. I made a map and everything worked just fine but suddenly when i try to run it on a different pc i got an error which said "can't load material 'code of material' ". I can't seem to find the object which misses a material. Is there any easy way to find it? There is an exclamation mark in the middle of my map.

Hello, you have a material on the worldremoved

write the FULL name in the search bar etidor and Show Removed Elements.

Sorry but my bad english

You can just repaint that area with new materials, until the exclamation is gone.