shipping/weight error

Could you do a screenshot of your shipping methods configuration ?
Did you set a weight in your products ?

If it displays that message, it's because of a weight restriction between your shipping methods and your products weight.

I can see that you restricted your shipping method to the zone queensland. So if the main tax zone option of the configuration is not that zone, it won't display the zone in the checkout.

Also, you should check that the first weight unit is kg in the configuration as you use kg everywhere.

Also, it's normal that the shipping method is not displayed as long as you don't enter your address in the checkout.

Finally, I invite you to check the FAQ regarding shipping methods display issues on the checkout:
www.hikashop.com/en/support/documentatio...ins-listing.html#faq

I tried to order that product:
rchelicoptersandhobbies.com.au/rc-helis/product/cid-5.html

It has a weight of 7.99kg.

You main zone is "australia" in the configuration.

In your shipping methods listing, there is no shipping method for australia for that weight, so it's normal that it displays that error message.