mne_do_forward_solution Desired tag (unknown [3600]) not found Forward computation failed (see above)

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1

Hi all,

I was curious why I might be getting this error.... for most of my files this command works problem free?

-thanks Dave

Running Command Number mne_do_forward_solution --subject $SUBJECT --src $SUBJECT-ico-5-src.fif --bem $SUBJECT-5120-5120-5120-bem-sol.fif --meas $file --eegonly --fwd ${SUBJECT}_AR_noBC-epoched-${SUBJECT}-5-eeg-src-fwd.fif --overwrite /mnt/thothdisk1/K_AWARD/K_DATA/MEG_DATA/L16962/meg/L16962_AR_noBC-epoched.fif

mne_forward_solution version 2.10 compiled at Sep 4 2013 04:24:23

Source space : /mnt/thothdisk1/K_AWARD/K_DATA/MEG_DATA/L16962/bem/L16962-ico-5-src.fif
MRI -> head transform source : /mnt/thothdisk1/K_AWARD/K_DATA/MEG_DATA/L16962/mri/T1-neuromag/sets/COR-neuromag_101013.fif
Measurement data : /mnt/thothdisk1/K_AWARD/K_DATA/MEG_DATA/L16962/meg/L16962_AR_noBC-epoched.fif
BEM model : /mnt/thothdisk1/K_AWARD/K_DATA/MEG_DATA/L16962/bem/L16962-5120-5120-5120-bem.fif
Accurate field computations
Do computations in head coordinates.
Free source orientations
Destination for the solution : L16962_AR_noBC-epoched-L16962-5-eeg-src-fwd.fif

Reading /mnt/thothdisk1/K_AWARD/K_DATA/MEG_DATA/L16962/bem/L16962-ico-5-src.fif...
Read 2 source spaces a total of 20484 active source locations

Desired tag (unknown [3600]) not found
Forward computation failed (see above)
David I. Leitman PhD

Research Assistant Professor
Department of Psychiatry-
Neuropsychiatry program
Perelman School of Medicine
University of Pennsylvania
Gates Pavilion 10th floor room 1042
3400 Spruce St
Philadelphia, PA 19104-4283
P: (215) 662-7389
F: (215) 662-7903
E: leitman at mail.med.upenn.edu
Faculty page: http://www.med.upenn.edu/apps/faculty/index.php/g275/p8174343
Lab website:
http://davidileitman.com

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2

hi David,

are you sure it's the same command line you type all the time?

is there a chance the measurement info changed between acquisitions?

btw I recommend you name your evoked data finishing with -ave.fif
Consistency in fif files naming really helps.

Alex

3

Hi David,

The error message you get is fake. This does not directly relate to what happened.

Is

Read 2 source spaces a total of 20484 active source locations

indeed, the last log line before the error message? Can you send

/mnt/thothdisk1/K_AWARD/K_DATA/MEG_DATA/L16962/mri/T1-neuromag/sets/COR-neuromag_101013.fif

to me. Next after the source space setup mne_forward_solution should read the MRI/MEG transform from this file but I cannot see how this could fail without producing the correct error message.

- Matti

4

Hi Matti,

For some reason file COR-neuromag_101013.fif was created but it has zero bytes in it! must have not been saved or was corrupted. Will have to create a new COR file and try again :slight_smile:

thanks for the help.

dave

5

Hi Dave,

I removed the loophole in MNE-C which caused the uninformative error message to appear. This fix will be present tomorrow in the "nightly build" on our website. If you the coordinate transformation file is empty, you will get the correct error message.

- Matti