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Image: reddit.com · Fix: Arduino IDE 2.3.6+ Opens Terminal Window with "watchman not recognized" Error on Windows

Worked Proof shown

Arduino IDE's watchman error window on Windows tracked down

Claude helped find why Arduino IDE 2.3.6+ opened a terminal window with a 'watchman not recognized' error on Windows, and how to fix it.

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Credits

  • Reddit poster fullmonkeyheadon Source ↗

Earliest dated source: 9 Mar 2026

The full story

After reinstalling the Arduino IDE on Windows, the maker got a terminal window on every launch saying 'watchman' is not recognized. It was harmless, but web searches found nothing, because the problem spans several products and is reported in other projects' trackers.

With Claude's help the maker identified the cause and solutions, and wrote them up in a public gist.

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Sources

From a short post by the maker, so the details are as they tell them.

  • Reddit: Fix: Arduino IDE 2.3.6+ Opens Terminal Window with "watchman not recognized" Error on WindowsForum threadreddit.com
    Reddit poster: fullmonkeyheadonPosted 9 Mar 2026

    The maker's post on r/arduino.

    If it disappears: archived copy of Reddit: Fix: Arduino IDE 2.3.6+ Opens Terminal Window with "watchman not recognized" Error on Windows (opens in a new tab)

  • The code: gist.github.comCode or repositorygist.github.com

    The maker's write-up of the fix.

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