Fatal error: Uncaught Error: Interface "Mdanter\Ecc\Crypto\Key\PrivateKeyInterface" not found in /home/pay/public_html/vendor/bitcoin/mdanter/ecc/src/Crypto/Key/PrivateKey.php:40 Stack trace: #0 {main} thrown in /home/pay/public_html/vendor/bitcoin/mdanter/ecc/src/Crypto/Key/PrivateKey.php on line 40