Class 'Ethereum\DataType\Ethereum' not found

[nasingyo]

Symfony\Component\Debug\Exception\FatalThrowableError : Class 'Ethereum\DataType\Ethereum' not found

at vendor/digitaldonkey/ethereum-php/src/DataType/Filter.php:73
69| $return = [];
70| (!is_null($this->fromBlock)) ? $return['fromBlock'] = $this->fromBlock->hexVal() : NULL;
71| (!is_null($this->toBlock)) ? $return['toBlock'] = $this->toBlock->hexVal() : NULL;
72| (!is_null($this->address)) ? $return['address'] = $this->address->hexVal() : NULL;

73| (!is_null($this->topics)) ? $return['topics'] = Ethereum::valueArray($this->topics, 'EthD') : array();
74| return $return;
75| }
76| }

[apothan]

It likely needs a line at the top:
use Ethereum\Ethereum;