Adobe Reader Javascript Security Error

Good afternoon everyone, 

I am fairly new to Adobe, therefore I apologize for a potentially silly question. 

I created a form in which I used the following JavaScript to essentially add/remove additional pages based on whether one of the various check boxs are selected or not:

if(event.target.value!="Off")
{this.getTemplate("t1" ).hidden=false;}
else
{this.getTemplate("t1" ).hidden=true;}

My form works perfectfully fine when utilizing Adobe Acrobat Pro 2017; however, when opened in Adobe Reader (where the individuals receiving this form will be opening it) the form does not respond to the JavaScript function. I receieve the following error:

"NotAllowedError: Security settings prevent access to this property or method.
Template.hidden:2:Field Risk 1:Mouse Up".

I have done some reading some the error, but the error seems to be somewhat universal and could be a result of many different issues. 

Any thoughts on how to avoid this issue?

Many thanks!