java翻译成kotlin的错误问题?报错

这是java代码

public static short byteToShort(byte[] b) {
        short s = 0;
        short s0 = (short) (b[0] & 0xff);// 最低位
        short s1 = (short) (b[1] & 0xff);
        s1 <<= 8;
        s = (short) (s0 | s1);
        return s;
    }

然后通过工具翻译成kotlin

fun byteToShort(b: ByteArray): Short {
    var s: Short = 0
    val s0 = (b[0].toInt() and 0xff).toShort()// 最低位
    var s1 = (b[1].toInt() and 0xff).toShort()
    s1 = s1 shl 8 ///这里报错了，请问怎么办？
    s = (s0 or s1).toShort()
    return s
}