src/MarketplaceWebService/Model/ErrorResponse.php
public function setError($error)
    {
        if (!$this->_isNumericArray($error)) {
            $error = array($error);
        }
        $this->fields['Error']['FieldValue'] = $error;
        return $this;
    }
public function setError($error)
    {
        if (!$this->_isNumericArray($error)) {
            $error = array($error);
        }
        $this->fields['Error']['FieldValue'] = $error;
        return $this;
    }
Sets the value of the Error.

@param mixed $error Error or an array of Error Error
@return $this This instance