Insufficient number of outputs from right hand side of equal sign to satisfy assignment error in fieldtrip toolbox

I'm trying to run a sample code given found in the examples provided within the toolbox which is:

cfg1 = [];

cfg1.InstitutionName             = 'Radboud University';
cfg1.InstitutionalDepartmentName = 'Donders Institute for Brain, Cognition and Behaviour';
cfg1.InstitutionAddress          = 'Kapittelweg 29, 6525 EN, Nijmegen, The Netherlands';

% required for dataset_description.json
cfg1.dataset_description.Name                = 'EMG example';
cfg1.dataset_description.BIDSVersion         = 'unofficial extension';

% optional for dataset_description.json
cfg.dataset_description.License             = 'n/a';
cfg.dataset_description.Authors             = 'n/a';
cfg.dataset_description.Acknowledgements    = 'n/a';
cfg.dataset_description.Funding             = 'n/a';
cfg.dataset_description.ReferencesAndLinks  = 'n/a';
cfg.dataset_description.DatasetDOI          = 'n/a';

cfg1.method = 'copy'; % the original data is in a BIDS-compliant format and can simply be copied

cfg1.bidsroot = './bids';  % write to the present working directory
cfg1.datatype = 'emg';
cfg1.sub = 'NT05';

% these are general fields
cfg1.Manufacturer           = 'BrainProducts';
cfg1.ManufacturersModelName = 'BrainAmp MR plus';

% these are EMG specific fields
cfg1.emg.EMGPlacementScheme = 'electrode pairs were placed over various muscles';
cfg1.emg.EMGReference       = 'bipolar';
cfg1.emg.EMGGround          = 'unclear where the ground electrode was placed on the body';
cfg1.emg.EMGChannelCount    = 13; % it might actually be that some channels are recording something else

% there are two recordings of the EMG, during the RS scan and during the GABA scan
% in both EMG recordings the task for the subject was the same

cfg1.TaskDescription = 'The subject was lying in the MRI scanner during a resting-state BOLD scan, while EMG was being recorded';
cfg1.task = 'resting';
cfg1.dataset = './original/nt05_EMG_SESS1_RS_RAW.vhdr';
cfg1.run = 1;

% write the first EMG recording as run-1
data2bids(cfg1);

cfg1.TaskDescription = 'The subject was lying in the MRI scanner during a GABA MRS scan, while EMG was being recorded';
cfg1.task = 'resting';
cfg1.dataset = './original/nt05_EMG_SESS1_GABA_RAW.vhdr';
cfg1.run = 2;

% write the first EMG recording as run-2
data2bids(cfg1);

After I run it I get this error:

Insufficient number of outputs from right hand side of equal sign to satisfy assignment.

Error in ft_version (line 145)

ftver = a.Version;

Error in ft_preamble_init (line 50)

[FjmoT6aA_ft_ver, FjmoT6aA_ft_path] = ft_version;

Error in ft_preamble (line 83)

evalin('caller', full_cmd);

Error in data2bids (line 202)

ft_preamble init

Error in convert_to_bids (line 46)

data2bids(cfg1);

Initially cfg1 was cfg, but in one of the posted questions I found that it might be the variable's name so I changed it but still had the same error

[Walter Roberson]

For whatever reason, the Contents.m file, in the directory you installed the toolbox into, is either missing or else does not have a useable version field.

[Mahmoud Trabulsi]

What should I do?

I tried adding these to the code

restoredefaultpath
cd C:\Users\Adminstrator\Desktop\Thesis\fieldtrip\fieldtrip-20200310
addpath(pwd)
ft_defaults

and still go the same error

I started using MATLAB recently, so I have basic knowledge

[Walter Roberson]

After you have have done the above commands, please show the output of

which -all ft_version

Answer 1

[Daniel M]

Fieldtrip does not recommend adding the whole toolbox to your path. Just run the function ft_defaults.m and it will do it properly for you.

Try it by doing:

    if isempty(which('ft_preprocessing'))        
        restoredefaultpath
        startup;
        
        ft_dir = path/to/main/fieldtrip/folder;
        run(fullfile(ft_dir,'ft_defaults.m'));
    end

The purpose of the if statement is so that you don't need to alter your path everytime you run your script, since this is a time-expensive process.

See also:

http://www.fieldtriptoolbox.org/faq/should_i_add_fieldtrip_with_all_subdirectories_to_my_matlab_path/