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My guess would be its because you’re not qualifying the name of your Rules object – you’re asking Vuetify to find a rule called ‘required’ = but you have nothing in your data() with that name, you have an object called ‘mixinsRules’ and that in turn has a function called ‘required’.
Try qualifying the reference to ‘required’ with the name of its parent object, like this:
{
field: 'email',
//...
rules: '[mixinsRules.required]'
}
Source:stackexchange.com