From L-Acoustics:
That error is there to let you at some point, for some period of time, the mains were under voltage. It could have been a blip of time, so really only something that needs to be monitored.
To clear it, it just needs a full power cycle and the error should go away.
If it happened to all the amps, then it is an indication of building power. If it is a single amp and happens again, it an internal issue and would need to go for repair.
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