when i am trying to execute aura if in component it is not working - salesforce-lightning

when i am executing my aura:if it is not working below are code and the error
can anyone help me out with this.
thanks in advance.
enter image description here
this is error I am getting
this is code in component
this is code in controller
this is code in helper

use this code:
<aura:if isTrue="{!v.checkBoxvalue">
Your code..
</aura:if>
No need to check boolean value with string.

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