The “Property or method not defined on the instance but referenced during render” error is a common error in Vue that can occur when you try to access a property or method that is not defined in the component instance. Here are some steps to help you solve this error:
Check the template for typos: The error may be caused by a typo in the component’s template. Check the spelling of the property or method in your template.
Verify the data and methods: Make sure that the property or method you are trying to access is actually defined in the data or methods of the component instance.
Check the component instance: Ensure that the component instance is created and mounted properly. If you are using a child component, make sure it is properly registered and imported.
Use computed properties or watchers: Instead of accessing a property directly in the template, consider using a computed property or a watcher to manipulate the data or methods.
Use v-if directive: If the error occurs because you’re trying to access a property before it’s defined or loaded, you can use the v-if directive to delay the rendering of the component until the property is defined.
By following these steps, you should be able to fix the “Property or method not defined on the instance but referenced during render” error and ensure that your Vue application is functioning properly.