Rereferencing EEG

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Hi!
I'm trying to create a bipolar montage using 21 electrodes using
set_bipolar_reference. However, MNE gives me the error that (ie)
"Channel(s) EEG020, EEG013 not found, nothing dropped" even though these
channels do exist (and contain raw data). How come I get this error?

Best, Karin
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Can you share a code snippet and data required to reproduce the error?