In general, I found my file on an old laptop with an electrum folder, I have several files and one of them is my wallet.dat 24kb in size,
Wallet.dat?
Wallet.dat files are for bitcoin core, not electrum.
and when I enter wallet dat and with these errors, electrum shows my old normal balance, but I can’t withdraw bitcoins because of these errors,
Th error says that you are signing your transaction with a wrong private key.
You have purchased the wallet file. Am I right? If so, the seller gave you a corrupted wallet file and you have been scammed.
Someone created a similar topic reporting the same error when trying to make a transaction.
[HELP] Electrum script failed