[FieldTrip] i got this error

[Mohamed Fawzy]

ft_definetrial (cfg);Warning: file or directory "ArtifactMEG.ds" does not exist, could not determine fileformat Warning: file or directory "ArtifactMEG.ds" does not exist, could not determine fileformat Warning: file or directory "ArtifactMEG.ds" does not exist, could not determine fileformat Warning: no trialfun was specified, using ft_trialfun_general evaluating trialfunction 'ft_trialfun_general'reading the header from 'ArtifactMEG.ds'Error using ft_read_header (line 202)file or directory 'ArtifactMEG.ds' does not exist
Error in ft_trialfun_general (line 84)  hdr = ft_read_header (cfg.headerfile, 'headerformat', cfg.headerformat);
Error in ft_definetrial (line 178)    [trl, event] = feval (cfg.trialfun, cfg);how i fix it 
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