How to write a fusion

I'm getting this error message Error in score_total (line 25) output = My_predict(mdl,mdl2,tst_dat);

Here's how I used the code:

clear all load my_ftrs_LBP

features_LBP =[];

trn_per_paper = 1;

for i = 1:50

img = fetch7_P{i}; features = extractLBPFeatures(img);

features_LBP = [ features_LBP; features ]; end

save my_ftrs_LBP fetch7_P features_LBP all_labels_LBP

[trn_dat, trn_lbl, tst_dat, tst_lbl ] = splitTrainTest(features_LBP,all_labels_LBP,trn_per_paper);

mdl=fitcknn(trn_dat, trn_lbl); results = predict(mdl, tst_dat); mdl2=fitctree(trn_dat, trn_lbl); results2 = predict(mdl2, tst_dat); output = My_predict(mdl,mdl2,tst_dat); [lbl,scr] = predict(mdl,tst_dat); [lbl2,scr2] = predict(mdl2,tst_dat); tot_scr = scr1+scr2; [val posn] = max(tot_scr,[],2); output = posn