Problem with login button

i get this error msg when i press my login button

login.php:56 Uncaught TypeError: Failed to execute 'appendChild' on 'Node': parameter 1 is not of type 'Node'.
at login (login.php:56)
at HTMLButtonElement.onclick (login.php:10)

but i have no idea how to fix it

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The appendChild() function expects a DOMNode as a parameter, but you're giving it a string. Are you trying to make the elements for the login form?