hello my name is william this is my problem :
i have a wallet.dat file y know the passphrase , i already install bitcoin core and open the file, but when i want to transfer the funds i have this error "error unlocking wallet: some keys decrypt bur not all. Your wallet file may be corrupt", i already use pywallet.py and i have the private key that is encryted so if i have the password for that wallet how can i decryt the private key so i can access to my funds!, if someone can help me i will pay 2 btc in rewards!

thanks!