Fatal error: Uncaught Error: Interface "Mdanter\Ecc\Serializer\PrivateKey\PrivateKeySerializerInterface" not found in /home/pay/public_html/vendor/bitcoin/mdanter/ecc/src/Serializer/PrivateKey/DerPrivateKeySerializer.php:23 Stack trace: #0 {main} thrown in /home/pay/public_html/vendor/bitcoin/mdanter/ecc/src/Serializer/PrivateKey/DerPrivateKeySerializer.php on line 23