Error 400 with printful

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Uncaught TypeError: Cannot read property 'description' of undefined
at Object.error (dbtfy.js:1)
at i (jquery-2.2.3.min.js?v=14258658474333077729:2)
at Object.fireWith [as rejectWith] (jquery-2.2.3.min.js?v=14258658474333077729:2)
at z (jquery-2.2.3.min.js?v=14258658474333077729:4)
at XMLHttpRequest.<anonymous> (jquery-2.2.3.min.js?v=14258658474333077729:4)
localhost:8000//app/getLicenseKey? Failed to load resource: net::ERR_CONNECTION_REFUSED

this error appears when i try inspect element on console tab

the same error appears when my customers try to use the personalize design option offered by printful

i am using debutify with all the addons and was supossing there is an overlap caused by the addons codes