Error using plot command

 hello,
I am attempting to replot my data however I received this error
Error using symengine
The dimensions do not match.

Error in sym/privBinaryOp (line 937) Csym = mupadmex(op,args{1}.s, args{2}.s, varargin{:});

Error in * (line 270) X = privBinaryOp(A, B, 'symobj::mtimes');

Error in cfit/plot (line 87) xfit = minx + .001*diff(xlim)*(0:1000)'; Can anyone help with these? G.