[FieldTrip] Where to add a trialfun?

[Ana Laura Diez Martini]

Hello all! I'm having a simple problem. I want to add this trialfun:

http://fieldtrip.fcdonders.nl/faq/how_can_i_transform_trigger_values_from_bits_to_decimal_representation_with_a_trialfun

I get this error:

Reference to non-existent field 'trialdef'.

Error in trialfun_bit2dec (line 52)
  if strcmp(event(i).type, cfg.trialdef.eventtype)

I'm quite sure it's because I'm not writing it in the correct part of my
script. This is my trial definition part. Where should I add it and how
should I write the line?

  % TRIAL DEFINITION
    cfg=[];
    cfg.filename = ['my/folders/', subject, '.RAW'];
    cfg.headerfile = ['my/folders/', subject, '.RAW'];

    cfg.trialdef.eventtype    = 'STATUS';
    cfg.trialdef.eventvalue   = cgrmrk;
    cfg.trialdef.prestim      = 0.2;
    cfg.trialdef.poststim     = 1;
    cfg.trialdef.eventtype=?;

    cfg = definetrial(cfg);

    trl = cfg.trl;
    cfg=[];
    cfg.dataset = ['my/folders/', subject, '.RAW'];
    cfg.trl           = trl;
    cfg.reref         = 'yes';
    cfg.refchannel    = ['all'];

THANKS!
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