idk what this error means and how to debug it

Are u using any auth library like next auth or any server actions where the action returns data which you might be using on the client?

yes i have api calls

to my database which is a server action and that returns the data to my client

i noticed the issue popped up when i turned my server component to a server action

Well it seems it's your server action causing issue

This happened with me as well when I was trying to return some data from server action

Console.log your return data in server action and let me know what it is