Error while using Matlab LiveLink

I'm facing a problem while using Matlab LiveLink.

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geom1 = model.geom.create('geom1', 2);

c1 = geom1.create('c1', 'Circle');
c1.label('c1')
c1.set('r', '40');

c2 = geom1.create('c2', 'Circle');
c2.label('c2');
c2.set('r', '20');

dif1 = geom1.create('dif1', 'Difference');
dif1.selection('input').set(c1.label);
dif1.selction('input2').set(c2.label);
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The code above gave the following error.

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No method 'set' with matching signature found for class 'com.comsol.clientapi.impl.LocalGeomObjectSelectionClient'.

Error in
dif1.selection('input').set(c1.label);
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Could anyone explain why this is happening?