Error Unsupported Server Component type undefined

Hey,
I'm playing around with Next 13 rn and I encountered an issues.
I have my root layout.tsx
Which only has the default stuff in it + my Navbar Component
The page.tsx uses a server side component to fetch data from my database and display it.
My navbar component however I want to be a client side component, once i add "use client"; to the file i get the error: Error: Unsupported Server Component type: undefined
In my server console it tells me to check the line where I use the Navbar component in the layout.
Has anyone faced a similar project or this how its supposed to work?
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