Error when launching headless server

[Warlord2150]

Hey folks. Can anyone tell me why I'm getting the error on line 22 here? I'm trying to do this for the first time, so I may well have derped this entire process, but nevertheless, I'd like to see it done. I have all the json files and the testserver.zip in the same directory there, which I think is right. Any suggestions?

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C:\Program Files (x86)\Steam\steamapps\common\Factorio\bin\x64>start /wait factorio.exe --start-server testserver.zip --map-gen-settings map-gen-settings.json --map-settings map-settings.json --server-settings server-settings.json
   0.002 2018-04-18 23:17:13; Factorio 0.16.36 (build 36253, win64, steam)
   0.002 Operating system: Windows 10 (version 1709)
   0.002 Program arguments: "factorio.exe" "--start-server" "testserver.zip" "--map-gen-settings" "map-gen-settings.json" "--map-settings" "map-settings.json" "--server-settings" "server-settings.json"
   0.002 Read data path: C:/Program Files (x86)/Steam/steamapps/common/Factorio/data
   0.002 Write data path: C:/Users/Us/AppData/Roaming/Factorio [168469/714386MB]
   0.002 Binaries path: C:/Program Files (x86)/Steam/steamapps/common/Factorio/bin
   0.009 System info: [CPU: AMD Ryzen 5 1500X Quad-Core Processor          , 8 cores, RAM: 3882/16336 MB, page: 5459/18768 MB, virtual: 153/134217727 MB, extended virtual: 0 MB]
   0.010 Running in headless mode
   0.050 Loading mod core 0.0.0 (data.lua)
   0.064 Loading mod base 0.16.36 (data.lua)
   0.207 Loading mod base 0.16.36 (data-updates.lua)
   0.255 Checksum for core: 1316978547
   0.256 Checksum of base: 4140083139
   0.345 Info PlayerData.cpp:67: Local player-data.json unavailable
   0.345 Info PlayerData.cpp:72: Cloud player-data.json unavailable
   0.347 Custom inputs active: 0
   0.349 Factorio initialised
   0.350 Info ServerSynchronizer.cpp:29: nextHeartbeatSequenceNumber(0) initialized Synchronizer nextTickClosureTick(0).   0.350 Info ServerMultiplayerManager.cpp:698: mapTick(4294967295) changing state from(Ready) to(PreparedToHostGame)
   0.350 Info ServerMultiplayerManager.cpp:698: mapTick(4294967295) changing state from(PreparedToHostGame) to(CreatingGame)
   0.350 Loading map C:\Program Files (x86)\Steam\steamapps\common\Factorio\bin\x64\testserver.zip: 22 bytes.
   0.351 Error ServerMultiplayerManager.cpp:96: MultiplayerManager failed: "Opening zip C:/Program Files (x86)/Steam/steamapps/common/Factorio/bin/x64/testserver.zip failed: I/O error"
   0.351 Info ServerMultiplayerManager.cpp:698: mapTick(4294967295) changing state from(CreatingGame) to(InitializationFailed)
   0.352 Info ServerMultiplayerManager.cpp:142: Quitting multiplayer connection.
   0.352 Info ServerMultiplayerManager.cpp:698: mapTick(4294967295) changing state from(InitializationFailed) to(Closed)   0.376 Info UDPSocket.cpp:206: Closing socket
   0.376 Goodbye

C:\Program Files (x86)\Steam\steamapps\common\Factorio\bin\x64>pause
Press any key to continue . . .

[Loewchen]

testserver.zip is a working save file you want to load on start?

[Warlord2150]

It is an empty zip directory that I assumed the game deposited the necessary files into when the game is created.

[Loewchen]

--start-server expects a working save, if you want to create a map use --create, see: https://wiki.factorio.com/Multiplayer. Creating a save manually in game is to recommend as not all maps are playable.

[Warlord2150]

Hmm, ok. I'll give that a whirl. Thanks!