FW: Fieldtrip to extract source signal

[Rajamoni Nadar, Sreenivasan (NIH/NIMH) [E]]

Dr. Oostenveld,

Attached is the code that I used to extract single trial source time series from MEG dataset (CTF). It is giving the following error while calling the routine prepare_leadfield. Could you please let me know the way to fix it?

Thanks,
Vasan

%~~~~~~~~~~~~~~~ see the error message~~~~~~~~~~~~~~~
the input is timelock data with 273 channels and 300 timebins
reading headmodel from file '/gs1/users/rajamoni/MEG_ds/AEDTPJOU_nback_20050422_01-f.ds/default.hdm'
using gradiometers specified in the data
precomputing leadfields for efficient handling of multiple trials
reading headmodel from file '/gs1/users/rajamoni/MEG_ds/AEDTPJOU_nback_20050422_01-f.ds/default.hdm'
using gradiometers specified in the data
creating dipole grid based on user specified dipole positions
0 dipoles inside, 1 dipoles outside brain
computing leadfield
??? Reference to non-existent field 'type'.

Error in ==> prepare_leadfield at 133
if strcmp(vol.type, 'openmeeg')

Error in ==> sourceanalysis at 322
  [grid, cfg] = prepare_leadfield(cfg, data);

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