BPOST LABEL PRINT ERROR

Hello,

I am using the bpost plugin, but when I print the bpost label, page gives 500 error.

How can I solve this issue,
this is my debug log of bpost plugin

03-08-2018 @ 07:35:49 – [ERROR] Invalid response: Error in request: Could not find resource for relative : /external/001602/orders//labels/A6 of full path: https://shm-res-pr.netpost/api/external/001602/orders//labels/A6: {“code”:404,”message”:”Invalid response: Error in request: Could not find resource for relative : \/external\/001602\/orders\/\/labels\/A6 of full path: http:\/\/shm-res-pr.netpost\/api\/external\/001602\/orders\/\/labels\/A6″,”trace”:[{“file”:”\/var\/web\/vd7238\/public_html\/wp-content\/plugins\/bpost-shipping\/vendor\/antidot-be\/bpost-api-library\/src\/Bpost.php”,”line”:563,”function”:”doCall”,”class”:”Bpost\\BpostApiClient\\Bpost”,”type”:”->”,”args”:[“\/orders\/\/labels\/A6”,null,[“Accept: application\/vnd.bpost.shm-label-pdf-v3.4+XML”,”Authorization: Basic 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