Use objects of class 'comm.LDPCEncoder' only as scalars or use a cell array.

I am getting this error :

Array formation and parentheses-style indexing with objects of class 'comm.LDPCEncoder' is not allowed. Use

objects of class 'comm.LDPCEncoder' only as scalars or use a cell array.

Error at : encData = ldpcEncoder(dataIn)

my code lines are is:

dataIn = logical(randi([0 1],FFT_LEN,1));

encData = ldpcEncoder(dataIn);

please suggest what to do