error util.cpp:57: duplicate mod base

[playedspades]

Setting up a headless linux server on CentOS 7. Everything looks basically good to go, until I try to generate a new map.

The command I'm using to create the map is:

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# sudo /opt/factorio/bin/x64/factorio --create /opt/factorio/saves/1.zip --mod-directory /opt/factorio/data/ --map-gen-settings /opt/factorio/data/map-gen-settings.json --server-settings /opt/factorio/data/server-settings.json

Which results in this output:

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   0.009 2016-11-24 02:13:53; Factorio 0.14.20 (build 25315, linux64, headless)
   0.009 Operating system: Linux
   0.009 Program arguments: "/opt/factorio/bin/x64/factorio" "--create" "/opt/factorio/saves/1" "--mod-directory" "/opt/factorio/data" "--map-gen-settings" "/opt/factorio/data/map-gen-settings.json" "--server-settings" "/opt/factorio/data/server-settings.json" 
   0.009 Read data path: /opt/factorio/data
   0.010 Write data path: /opt/factorio
   0.010 Binaries path: /opt/factorio/bin
   0.043 System info: [CPU:           Intel(R) Celeron(R) CPU 847 @ 1.10GHz, 2 cores, RAM: 7710MB]
   0.044 Running in headless mode
   0.048 Info ModManager.cpp:98: Found duplicate mod Aircraft, using folder version (1.1.4).
   0.050 Error Util.cpp:57: Filename of mod /opt/factorio/data/base doesn't match the expected base_0.14.20 (case sensitive!)

I skipped troubleshooting the Aircraft mod because I just wanted to see if the save file would create at all. I removed the aircraft mod directory and rename the base mod directory to base_0.14.20, and ran the same command. Results in this output:

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   0.002 2016-11-24 02:20:15; Factorio 0.14.20 (build 25315, linux64, headless)
   0.002 Operating system: Linux
   0.002 Program arguments: "/opt/factorio/bin/x64/factorio" "--create" "/opt/factorio/saves/1" "--mod-directory" "/opt/factorio/data" "--map-gen-settings" "/opt/factorio/data/map-gen-settings.json" "--server-settings" "/opt/factorio/data/server-settings.json" 
   0.002 Read data path: /opt/factorio/data
   0.002 Write data path: /opt/factorio
   0.002 Binaries path: /opt/factorio/bin
   0.053 System info: [CPU:           Intel(R) Celeron(R) CPU 847 @ 1.10GHz, 2 cores, RAM: 7710MB]
   0.054 Running in headless mode
   0.060 Error Util.cpp:57: Duplicate mod base.

This util.cpp:57: duplicate mod error is literally nowhere on the internet, and this is my first excursion into advanced linux, so I'm really at a loss. If anybody has any clue, please let me know.

[playedspades]

nevermind, I figured it out. Don't specify your mod directory as the same directory core and base are in.