Cannot read property 'appendChild' of null at buildMbox

[abbyd77023085]

Why i am getting this error in chrome console

Uncaught TypeError: Cannot read property 'appendChild' of null

    at buildMbox (mbox.js:formatted:2168)

    at configureMboxAffinity (mbox.js:formatted:2190)

    at mbox.js:formatted:2191

buildMbox @ mbox.js:formatted:2168

configureMboxAffinity @ mbox.js:formatted:2190

(anonymous) @ mbox.js:formatted:2191

I am using Mbox.js

[Amelia_Waliany]

Hi there, thanks for your question. Is it used via DTM?