I followed the tutorial that Marc mentioned, but I was unable to fix the problem. After using the defaults mentioned in the tutorial I received this error:
** Error: [process_adjust_coordinates] Import > Channel file > Adjust coordinate system
** Line 40: ctf_seek (line 40)
** Epoch #1 is not accessible in any of the meg4 files of this dataset.
**
** Call stack:
** >ctf_seek.m at 40
** >in_fread_ctf.m at 92
** >in_fread_ctf.m at 81
** >in_fread.m at 84
** >process_evt_head_motion.m>LoadHLU at 358
** >process_evt_head_motion.m at 24
** >process_adjust_coordinates.m>AdjustHeadPosition at 473
** >process_adjust_coordinates.m>Run at 174
** >process_adjust_coordinates.m at 24
** >bst_process.m>Run at 229
** >bst_process.m at 36
** >panel_process1.m>RunProcess at 151
** >panel_process1.m at 26
** >gui_brainstorm.m>CreateWindow/ProcessRun_Callback at 788
** >bst_call.m at 28
** >gui_brainstorm.m>@(h,ev)bst_call(@ProcessRun_Callback) at 312
**
**
** File: S08pre/@rawsub-S08pre_ses-20190424_task-AEF_run-07_meg/data_0raw_sub-S08pre_ses-20190424_task-AEF_run-07_meg.mat
**
I was a little confused by this error because I've analyzed other runs from this subject with no issues so I'm not sure why the first epoch is not accessible? Ideas?
Thank you!