The error suggests an issue with the JSX syntax or improper handling of components and functions. Review how elements like the cart and UserButton are implemented.
Make sure you are returning valid JSX from your Navbar function. You should also check if 'cart' prop is received correctly and has items.
If you're rendering the cart quantity or UserButton conditionally, ensure the conditions are correctly defined to avoid runtime errors.
Also, pay attention to other imports or components in your code that might be causing side effects, or conflicts with the current setup.
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