# Error computing inverse operator using sample dataset

**URL:** <https://mne.discourse.group/t/error-computing-inverse-operator-using-sample-dataset/25>\
**Category:** Mailing List Archive (read-only)\
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**Created:** [January 23, 2008, 11:26pm UTC](https://mne.discourse.group/t/error-computing-inverse-operator-using-sample-dataset/25 "2008-01-23T23:26:42Z")\
**Posts on this 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:** [January 23, 2008, 11:26pm UTC](https://mne.discourse.group/t/error-computing-inverse-operator-using-sample-dataset/25/1 "2008-01-23T23:26:42Z")

</div>

I'm getting the following error when running the mne\_do\_inverse\_operator  
function:

> Sum of covariance matrix elements is zero!

I noticed that the source covariance matrix is the identity matrix. Could  
this be the source of the problem? Have I missed some step on the way which  
may have caused this problem?

Thank you,  
Michael  
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