PDF Template spawn error NotAllowedError

I have problem to spawn Template in PDF form. I have this code:

var expTplt = getTemplate("myTemplateR");

expTplt.spawn(pageNum+1,true,false);

I have this error in Reader X:

NotAllowedError: Security settings prevent access to this property or method.

Template.spawn:2:Field GET TEMP:Mouse Up

Any idea to resolve this problem?