Not creating checkbox grid selector widget

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Hi all,   In my model I've implemented the checkbox grid selector widget. Everything looks okay, but when I run locally and preview in my browser I see the red message 'Could not create widget GridSelector.widget.CheckboxGrid’. The weird thing is that on the test environment I can see the widget.    Anyone ideas how to solve this ?   Model   Local browser   Test environment
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Maybe something with browser cache? Did you also try it in “incognito modus”? 
The modus that you use when you are searching for a present for you girlfriend for example.

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Security roles been changed?

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