Thanks Andrew! Yes, it seems like something is really wrong with this scan: /autofs/space/frieda_003/users/valia/epilepsy_clin/5545419_1449/3D/dicom/IM-0001-0001.dcm

I’ll try to find another sequence. Thanks!

From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu On Behalf Of Hoopes, Andrew Sent: Tuesday, November 24, 2020 11:14 PM To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] error: MatrixMultiply: m1 is null

Hi Noam,

Do the volumes look okay? I’m seeing a lot of ‘non-orthogonal axes’ warnings in the log. If that’s not the issue, this could be a bug that’s randomly occurring with parallel recons in v7. Although, I’ve never seen it fail during mri_convert. Can you try to rerun? It might succeed the second time. If not, can you send us the input scan and try again without the -parallel flag.

best Andrew

From: <freesurfer-bounces@nmr.mgh.harvard.edumailto:freesurfer-bounces@nmr.mgh.harvard.edu> on behalf of "Peled, Noam" <NPELED@mgh.harvard.edumailto:NPELED@mgh.harvard.edu> Reply-To: FS Help <freesurfer@nmr.mgh.harvard.edumailto:freesurfer@nmr.mgh.harvard.edu> Date: Tuesday, November 24, 2020 at 10:10 PM To: FS Help <freesurfer@nmr.mgh.harvard.edumailto:freesurfer@nmr.mgh.harvard.edu> Subject: [Freesurfer] error: MatrixMultiply: m1 is null

Dear FreeSurfer community, I encountered a recon-all error where I couldn’t find on the web. The error message is: “error: MatrixMultiply: m1 is null!”. You can find the complete log attached. I used the stable7.1.1 version.

Thanks, Noam