the wallet is encrypted, but no passphrase was used

[faust87280]

I try to find my old bitcoin private key .
But everytime i open the soft, it says that the wallet is encrypted, but no passphrase was used.
I didn't use a password, or if there is a password I don't remember creating one.
How can i recover my btc please?
Thanks in advance.

[faust87280]

I've tried many times, but can't figure out how it works.
Everytime I try a passphrase with --passphrase= it bugs and says :
Warning: 'ecdsa' package is not installed, so you won't be able to sign/verify messages but everything else will work fine
Segmentation fault
please help, thanks.