Aus Post gives lots of errors on 1.5.4

Hi,

Everytime I reach Delivery Method the below errors appear and Australia Post is not listed as one of the Delivery Methods.

Division by zero in /system/library/weight.php on line 38
Undefined index: length_class in /catalog/model/shipping/auspost.php on line 77
Undefined index: length_class in /catalog/model/shipping/auspost.php on line 79
Division by zero in /system/library/length.php on line 38
Undefined index: length_class in /catalog/model/shipping/auspost.php on line 83
Division by zero in /system/library/length.php on line 38
Undefined index: length_class in /catalog/model/shipping/auspost.php on line 87
Division by zero in /system/library/length.php on line 38
Undefined index: length_class in /catalog/model/shipping/auspost.php on line 77

I have entered the dimension of the items in mm and weight in kg. But Aust Post still cannot detect the weight I've put in to the items. It is always showing The basket weight is 0g, unable to calculate shipping costs

Please help. Thanks.

Looks like I downloaded the wrong version of Aust Post. Everything is fixed using Aust Post 1511u4.

But how do I change estimated delivery time and the price? Thanks.