Canpar plugin error

-- HikaShop version -- : 2.3.5
-- Error-message(debug-mod must be tuned on) -- : Notice: Undefined index: XMLpackage in /home/bulkbu5/public_html/sandbox/plugins/hikashopshipping/canpar/canpar.php on line 502

Notice: Array to string conversion in /home/bulkbu5/public_html/sandbox/plugins/hikashopshipping/canpar/canpar.php on line 502

Notice: Array to string conversion in /home/bulkbu5/public_html/sandbox/plugins/hikashopshipping/canpar/canpar.php on line 502

Fatal error: [] operator not supported for strings in /home/bulkbu5/public_html/sandbox/plugins/hikashopshipping/canpar/canpar.php on line 523

I would get these errors when the grouped packages would exceed one (1). Each additional package over one would generate a string conversion error. I changed line 502 from

$data['XMLpackage'] .= $this -> _createPackage($data, $product, $rate, $order);

$data['XMLpackage'][] = $this -> _createPackage($data, $product, $rate, $order);

Hello Steve,
Can you show me some screenshots of how did you configured your Canpar shipping method so that I can test it on my end ?
Thanks.

Here's my current config.

I've also modified line 444 to accommodate a larger and heavier maximum box size.

$limitation = array('length' => 80, 'weight' => 34, 'width' => 50, 'height' => 50);

Hello Steve,
I just tested it on my end, and I'm not having any notice/fatal error.
Regarding the number that is currently displayed during your checkout workflow when you publish your Canpar shipping method, you should edit the canpar.php file and change this line :

echo($method['value']);

//echo($method['value']);