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This error:

[Vue warn]: existing instance property “fields” will be overwritten by a computed property with the same name.

in our case was caused by the vue-validate package
The problem is: both of the packages use the same name “fields”, to solve it you need to a little change in vue-validate

locale: Vue.config.lang,
fieldsBagName: ‘formFields’,

Change the name fieldsBagName to formFields for instance and everything will be fine