Output data size does not match net.outputs{1}.size?

I want to use self-organizing map for classification. My code is give n below:

load('TR10by10.mat');

FMat=double(Tr10by10); %%size of FMat is 100by23888; 100 is feature values, 23888 is number of samples

 [FMat,dataMean,dataStd]=NormaMean(FMat');

% Create a Self-Organizing Map
dimension1 = 10;
dimension2 = 10;
net = selforgmap([dimension1 dimension2]);

% Train the Network
net.trainParam.epochs=3000;
[net1,tr1] = train(net,FMat,TrainL1); % TrainL1 is 2by23888