react hook form with server action gives me the error fromdata.get is not a function

[tibo-koninckx]

I have a form with a server action to send data to my database. For my database I use postgresQL and drizzle orm.
When I try to send my form with my server action and react hook, I get this error:

So I created an onSubmit function for react hook form that I use in my form: const onSubmit = handleSubmit(data => { startTransition(() => { sendInvoiceData(data); }); });
and i use it by this way in my form tag: <form onSubmit={onSubmit}>
To extract data from my form and send it to the database, I retrieve my data this way: export async function sendInvoiceData(formdata: FormData) { const {userId} = auth(); const newInvoice: Invoice = { invoice_number: formdata.get("invoice_number") as string, invoice_date: new Date(formdata.get("invoice_date") as string).toISOString().split('T')[0], due_date: new Date(formdata.get("due_date") as string).toISOString().split('T')[0], send: formdata.has("send"), paid: formdata.has("paid"), valuta: formdata.get("valuta") as string, total_amount: Number(formdata.get("total_amount")), clientId: Number(formdata.get("client_id")), };
it always gives me the error: formdata.get is not a function.
How can i fix it, i use Nextjs with Typescript