It means one of the vehicles/stationary weapons loaded in GameplayObjects.con can't find the icon in the mod folder to load.
The only way to fix this is to load all the ObjectTemplate.setObjectTemplate objects' .tweak from the GPO into Notepad++ and search for the texture path inside objects_server.zip to replace it with an existing icon.
The placeholder icon might be missing the extension in the path also. The debugger log might show the vehicle that has the missing icon at the bottom usually.
Last edited by Arab on 2018-05-06 23:41, edited 4 times in total.