it's my code but i don't why it's show me this error...

[izharalikhan]

function detector = acfTrain_my( varargin )

% initialize opts struct
opts = initializeOpts( varargin{:} );
if(nargin==0), detector=opts; return; end

function opts = initializeOpts( varargin )
% Initialize opts struct.
dfs= { 'pPyramid',{}, 'modelDs',[100 41], 'modelDsPad',[128 64], ...
'pNms',struct(), 'stride',4, 'cascThr',-1, 'cascCal',.005, ...
'nWeak',128, 'pBoost', {}, 'seed',0, 'name','', 'posGtDir','', ...
'posImgDir','', 'negImgDir','', 'posWinDir','', 'negWinDir','', ...
'imreadf',@imread, 'imreadp',{}, 'pLoad',{}, 'nPos',inf, 'nNeg',5000, ...
'nPerNeg',25, 'nAccNeg',10000, 'pJitter',{}, 'winsSave',0 };
opts = getPrmDflt(varargin,dfs,1);
% fill in remaining parameters
p=chnsPyramid_my([],opts.pPyramid); p=p.pPyramid;
p.minDs=opts.modelDs; shrink=p.pChns.shrink;
opts.modelDsPad=ceil(opts.modelDsPad/shrink)*shrink;
p.pad=ceil((opts.modelDsPad-opts.modelDs)/shrink/2)*shrink;
p=chnsPyramid_my([],p); p=p.pPyramid; p.complete=1;
p.pChns.complete=1; opts.pPyramid=p;
% initialize pNms, pBoost, pBoost.pTree, and pLoad
dfs={ 'type','maxg', 'overlap',.65, 'ovrDnm','min' };
opts.pNms=getPrmDflt(opts.pNms,dfs,-1);
dfs={ 'pTree',{}, 'nWeak',0, 'discrete',1, 'verbose',16 };
opts.pBoost=getPrmDflt(opts.pBoost,dfs,1);
dfs={'nBins',256,'maxDepth',2,'minWeight',.01,'fracFtrs',1,'nThreads',1e5};
opts.pBoost.pTree=getPrmDflt(opts.pBoost.pTree,dfs,1);
opts.pLoad=getPrmDflt(opts.pLoad,{'squarify',{0,1}},-1);
opts.pLoad.squarify{2}=opts.modelDs(2)/opts.modelDs(1);
end
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Error;;;;

Undefined function 'getPrmDflt' for input arguments of type 'cell'.

Error in acfTrain_my>initializeOpts (line 208)
opts = getPrmDflt(varargin,dfs,1);

Error in acfTrain_my (line 115)
opts = initializeOpts( varargin{:} );