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Mission hub, unable to load mission due to WASM error

By @Marsvinet
    2026-06-06 20:49:03.735Z

    I have looked around this forum and the bug tracker, but not found any topic matching my error. When I try to load a mission through the mission hub, I get a red warning saying "WASM Error - Package files have not been copied yet. Cannot start scenario". I have installed mission hub through contrail and it appears to be properly installed, as I can create a mission, but not load it? Any thoughts to what is causing this?

    Solved in post #2, click to view
    • 2 replies
    1. Could you go to %appdata%\Microsoft Flight Simulator 2024\WASM\MSFS2024, right click the 'miltechsimulations-missionhub' folder and select Properties.

      In the popup window, make sure 'Read-only' is unchecked. Click apply. If there is another pop-up, select 'Apply changes to this folder, subfolders, and files'.

      Then (re-)start the sim. This issue seems to be caused by the folder blocked for read access.

      ReplySolution
      1. M
        In reply toMarsvinet:
        @Marsvinet
          2026-06-08 17:38:19.787Z

          I'll be damned, it's been a while since I had a write protected folder issue, but it did solve the problem. Thanks!

          1. Progress
            with handling this problem
          2. @MiltechSimulations accepted an answer 2026-06-08 07:25:24.813Z.