I've had this error before, but I just fixed it by closing some programs. But now I can't get rid of it even when I close programs.

It happens when the compiling comes to that point when it opens that window and goes through where you have all your reflection probes. I can compile if I untick lights, but of course I want lights ticked. I haven't seen this error before, and I've never seen anyone else get it. And no, my disk space is not low.

Does anyone have any ideas? I'm running out of hope.

The only time I've seen is when I tried to take some screenshots the other day and I could only get rid of it by turning off spec maps. It's certainly nothing to do with hard disk space like it says anyway because I have more than enough free space.

This probably doesn't help you since you're getting it during compiling and not in game, but yeh.

I've had this error before, but I just fixed it by closing some programs. But now I can't get rid of it even when I close programs.
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It happens when the compiling comes to that point when it opens that window and goes through where you have all your reflection probes. I can compile if I untick lights, but of course I want lights ticked. I haven't seen this error before, and I've never seen anyone else get it. And no, my disk space is not low.

Does anyone have any ideas? I'm running out of hope.

I used to get this all the time before I fixed the lights on the brushes,  You can learn how to do this in a blackjackjohnny tutorial.  Although what you can do is press okay or windows X.  And after that uncheck everything but "Build .ffs" and that should work with updated lighting.