# Rereferencing EEG

**URL:** <https://mne.discourse.group/t/rereferencing-eeg/1680>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [December 10, 2018, 8:53am UTC](https://mne.discourse.group/t/rereferencing-eeg/1680 "2018-12-10T08:53:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [December 10, 2018, 8:53am UTC](https://mne.discourse.group/t/rereferencing-eeg/1680/1 "2018-12-10T08:53:39Z")

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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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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [December 10, 2018, 10:56am UTC](https://mne.discourse.group/t/rereferencing-eeg/1680/2 "2018-12-10T10:56:29Z")

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External Email - Use Caution

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