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Invalid "use server" Value

Why This Error Occurred​

This error occurs when a "use server" file exports a value that is not an async function. It might happen when you unintentionally export something like a configuration object, an arbitrary value, or missed the async keyword in the exported function declaration.

These functions are required to be defined as async, because "use server" marks them as Server Actions and they can be invoked directly from the client through a network request.

Examples of incorrect code:

'use server'

// ❌ This is incorrect: only async functions are allowed.
export const value = 1

// ❌ This is incorrect: missed the `async` keyword.
export function getServerData() {
  return '...'
}

Correct code:

'use server'

// ✅ This is correct: an async function is exported.
export async function getServerData() {
  return '...'
}

Possible Ways to Fix It​

Check all exported values in the "use server" file (including export *) and make sure that they are all defined as async functions.