Insufficient data remaining for VarString

[marcianovc]

I am adapting the code to MarteXcoin, but this is happening this error, could you help me?

PHP Fatal error:  Uncaught BitWasp\Buffertools\Exceptions\ParserOutOfRange: Insufficient data remaining for VarString in /var/www/html/openassetsphp/vendor/bitwasp/buffertools/src/Buffertools/Types/VarString.php:55
Stack trace:
#0 /var/www/html/openassetsphp/vendor/youkchan/monacoin/src/Serializer/Transaction/TransactionInputSerializer.php(66): BitWasp\Buffertools\Types\VarString->read(Object(BitWasp\Buffertools\Parser))
#1 /var/www/html/openassetsphp/vendor/youkchan/monacoin/src/Serializer/Transaction/TransactionSerializer.php(70): BitWasp\Bitcoin\Serializer\Transaction\TransactionInputSerializer->fromParser(Object(BitWasp\Buffertools\Parser))
#2 /var/www/html/openassetsphp/vendor/youkchan/monacoin/src/Serializer/Transaction/TransactionSerializer.php(119): BitWasp\Bitcoin\Serializer\Transaction\TransactionSerializer->fromParser(Object(BitWasp\Buffertools\Parser))
#3 /var/www/html/openassetsphp/vendor/youkchan/monacoin/src/Transaction/TransactionFactory.php(48): BitWasp\Bitcoin\Serializer\Transaction\TransactionSerializer->par in /var/www/html/openassetsphp/vendor/bitwasp/buffertools/src/Buffertools/Types/VarString.php on line 55

My Martexcoin.php is:

<?php

namespace BitWasp\Bitcoin\Network\Networks;

use BitWasp\Bitcoin\Network\Network;
use BitWasp\Bitcoin\Script\ScriptType;

class Martexcoin extends Network
{
    /**
     * {@inheritdoc}
     * @see Network::$base58PrefixMap
     */
    protected $base58PrefixMap = [
        self::BASE58_ADDRESS_P2PKH => "32",
        self::BASE58_ADDRESS_P2SH => "05",
        self::BASE58_WIF => "b2",
    ];

    /**
     * {@inheritdoc}
     * @see Network::$bip32PrefixMap
     */
    protected $bip32PrefixMap = [
        self::BIP32_PREFIX_XPUB => "0488b21e",
        self::BIP32_PREFIX_XPRV => "0488ade4",
    ];

    /**
     * {@inheritdoc}
     * @see Network::$bip32ScriptTypeMap
     */
    protected $bip32ScriptTypeMap = [
        self::BIP32_PREFIX_XPUB => ScriptType::P2PKH,
        self::BIP32_PREFIX_XPRV => ScriptType::P2PKH,
    ];

    /**
     * {@inheritdoc}
     * @see Network::$signedMessagePrefix
     */
    protected $signedMessagePrefix = "MarteX Signed Message";

    /**
     * {@inheritdoc}
     * @see Network::$p2pMagic
     */
    protected $p2pMagic = "f5a23f2d";
    //protected $p2pMagic = "2d3fa2f5";

}