This is because you have an older iPod touch software version. you should at least, have the version 3.0 (or higher) to do that, plus, make sure you have the latest iTunes on your computer. click here to download the latest iTunes.
You can follow my guide on how you can upgrade your iPod software to 3.1.2 and not to the latest 3.1.3 by clicking here. This 3.1.2 upgrade will make it possible for you to jailbreak your iPod touch.
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This is because you have an older iPod touch software version. you should at least, have the version 3.0 (or higher) to do that, plus, make sure you have the latest iTunes on your computer. click here to download the latest iTunes.
You can follow my guide on how you can upgrade your iPod software to 3.1.2 and not to the latest 3.1.3 by clicking here. This 3.1.2 upgrade will make it possible for you to jailbreak your iPod touch.
For more iPod touch / iPhone tips, click here.