Class 'BitWasp\Bitcoin\Key\PrivateKeyFactory' not found

[shewasforever]

When I signed the transaction, there was an error：Class 'BitWasp\Bitcoin\Key\PrivateKeyFactory' not found。
There's something wrong with calling a function like this:
$txSkeleton = $txClient->sign($txSkeleton, $privateKeys);

I went to download the relevant files, but did not find this class,This has puzzled me for a long time. Is there a solution?

[quentinlesceller]

Hi @shewasforever the sample is outdated (use Php 4 and old version of BitWasp).
Replace it with https://github.com/blockcypher/php-client/pull/111/files#diff-9cdc1f36a9510f6bc3bda1713d8922d8R7

use BitWasp\Bitcoin\Key\Factory\PrivateKeyFactory;