Error Message in MEG source localisation Tutorial

[ingaac]

Hello!

I'm working through the MEG source localisation tutorial as described here: https://www.fil.ion.ucl.ac.uk/spm/docs/tutorials/MEEG/meg_sloc/, using the data linked in the tutorial (Preprocessed MEG data (SPM12 format): cdbespm12_SPM_CTF_MEG_example_faces1_3D.zip).

While following the tutorial instructions for simulating data using the "Simulation of sources" module, I receive an error message indicating that the forward model is missing. Specifically, after setting up the simulation parameters as per the tutorial, when I click the Run button in the batch editor, I get the following error:

"Error using spm_cfg_eeg_inv_simulate>run_simulation (line 213)
Forward model is missing for subject 1
In file "/Users/inga/Downloads/spm12/config/spm_cfg_eeg_inv_simulate.m" (v6926), function "run_simulation" at line 213.

The following modules did not run:
Failed: Simulation of sources"

Is the forward model supposed to be precomputed in the provided sample dataset for this tutorial? The tutorial does not mention computing the forward model as a prerequisite for this step, so I am unsure if this is an oversight or if I have missed a step.

I would appreciate any help in resolving this issue. As I'm new to SPM, it's possible that I might be making an error due to my inexperience with the software, but I'd like to double-check this all the same.

Thank you!

[tierneytim]

Hi @ingaac,

Sorry you ran into issues,
Could you tell us whether you are working with the SPM that is available here on GitHub or an older version?

[ingaac]

Hi Tim! I'm working with Version 24.1.0.2689473 (R2024a) Update 6
And I'm using macOS Monterey Version 12.5.1 (21G83)

[barnesgr123]

Dear Ingaac,
It looks like it is expecting you to have set up a forward model. Apologies this was missing from the instructions.
Could you please try pressing the 'Source Reconstruction' button on the front panel, setting up a forward model for these data (eg Single Shell) then try again and see what happens please.
best
Gareth