How to solve the “Error Mounting…” error dialog in LXDE / PCManFM

I’m getting the following dialog from time to time when playing music from my external HD:

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Whenever that happens, my music player (cmus) skips to the next track.
This happens with any music player I use, it doesn’t happen all the time though.

If not solving the issue, I’d like to no longer get these dialog popups, as they come in groups of 3-4, and often cannot be closed at all.

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Author: Asaf