Invalid syntax for calling function 'db' on the path. CAN SOMEBODY HELP ME WITH THIS ERROR :(

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function pushbutton4_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
im = handles.imdata1;
%% Find the class the test image belongs
Ftest=FeatureStatistical(im);
%% Compare with the feature of training image in the database
load 'db.mat'
Ftrain=db(:,1:2);
Ctrain=db(:,3);
for (i=1:size(Ftrain,1))
    dist(i,:)=sum(abs(Ftrain(i,:)-Ftest));
end   
m=find(dist==min(dist),1);
det_class=Ctrain(m);
if det_class == 1
R1 = 'Japanese Beetles';
set(handles.edit1,'string',R1);
%     helpdlg(' Japanese Beetles ');
%     disp(' Japanese Beetles ');
elseif det_class == 2
R2 = 'Whitefly';
set(handles.edit1,'string',R2);
%     helpdlg(' Whitefly ');
%     disp('Whitefly');
elseif det_class == 3
R3 = 'Stink Bug';
set(handles.edit1,'string',R3);
%     helpdlg(' Stink Bug ');
%     disp(' Stink Bug ');
elseif det_class == 4
R4 = 'Winter Mouth';
set(handles.edit1,'string',R4);
%     helpdlg(' Winter Mouth ');
%     disp('Winter Mouth');
% end
% Update GUI
end
guidata(hObject,handles);