I was planning a massive mod, but it already crashes at my first attempt. I added 3 mines (copper, silver and gold), each as an upgrade from the previous one. I only replaced the filenames for the sprites in the 3 from the original mine.lua and mine2.lua.
Any idea of what i'm doing wrong?
This is the log:

MainMenu: Skirmish
AddMapControls dir maps, filter *
AddWorkshopMapControls listName = ListFan, itemType = Map
added 15 workshop items out of a possible 180
FinaliseUpdateWorkshopItems: 180 items installed
MapSelect returned maps/Abyss
NavEvent_ChangeMods
AddMapControls dir mods, filter *
AddWorkshopMapControls listName = ListFan, itemType = Mod
Error loading file C:\Program Files (x86)\Games\Steam\steamapps\workshop\content\410900/1633085087/displayname.lua: ...Games\Steam\steamapps\workshop\content\410900/1633085087/displayname.lua:1: unexpected symbol near 'ï'
Error loading file C:\Program Files (x86)\Games\Steam\steamapps\workshop\content\410900\1633085087/displayname.lua: ...Games\Steam\steamapps\workshop\content\410900\1633085087/displayname.lua:1: unexpected symbol near 'ï'
added 58 workshop items out of a possible 180
NavEvent_ChangeMods started
FinaliseUpdateWorkshopItems: 180 items installed
LIBCURL success: File Downloaded successfully
renaming ui/screens/temp\IncursusYT.jpg.tmp to ui/screens/temp\IncursusYT.jpg
MapSelect returned mods/Middle_Ages
SelectEnemyCommander, exclude: unknown
Testing commander against exclusion: commander-ee-fireman
Loading enemy commander script: commander-ee-fireman
successful
Canceling background load thread at index 895/2189
Closing background load thread at 20.4s
Activating mod Skirmish
Activating mod Repair Station
Activating mod Tons of Guns
Activating mod Middle Ages
Random seed: 6428 from timestamp 20190531_004322
Game mode: Team Co-op
Team1 commander: commander-ee-marksman
Team2 commander: commander-ee-fireman
Starting 9 physics worker threads...
LIBCURL success: File Downloaded successfully
renaming ui/screens/temp\mainmenu.lua.tmp to ui/screens/temp\mainmenu.lua
Error: no preview found for devices/mine_copper.lua, a crash is likely
Error: no preview found for devices/mine_silver.lua, a crash is likely
Error: no preview found for devices/mine_gold.lua, a crash is likely
Error: no preview found for devices/mine_copper.lua, a crash is likely
Error: no preview found for devices/mine_silver.lua, a crash is likely
Error: no preview found for devices/mine_gold.lua, a crash is likely
Error: no preview found for devices/mine_copper.lua, a crash is likely
Error: no preview found for devices/mine_silver.lua, a crash is likely
Error: no preview found for devices/mine_gold.lua, a crash is likely
Error: no preview found for devices/mine_copper.lua, a crash is likely
Error: no preview found for devices/mine_silver.lua, a crash is likely
Error: no preview found for devices/mine_gold.lua, a crash is likely
GenerateCrashDump at frame 0
Last Store ui/screens/context_time_preview.lua
Setting NumGames 287
OnUserStatsStored, result 1
StoreStats - success
StatsAndAchievements::OnSessionEnded
writing debug files to crashdumps\crash 2019-05-31 004324 Se
GenerateCrashDump folder crashdumps\crash 2019-05-31 004324 Se
CopyLog
LIBCURL success: File Downloaded successfully
renaming ui/screens/temp\strings\language-English\strings.lua.tmp to ui/screens/temp\strings\language-English\strings.lua