When i login in incognito with the chrome browser, right after login this error is being displayed. Without incognito its working fine and from other browsers also it's working fine.

Below is the error.

Uncaught TypeError: Cannot read property 'removeClass' of undefined

http://devappsrvr:8069/web/content/482-fb88551/web.assets_common.js:3948
Traceback:
TypeError: Cannot read property 'removeClass' of undefined
    at Class._reposition (http://devappsrvr:8069/web/content/482-fb88551/web.assets_common.js:3948:313)
    at Class.update (http://devappsrvr:8069/web/content/482-fb88551/web.assets_common.js:3947:6)
    at Class._check_for_tooltip (http://devappsrvr:8069/web/content/482-fb88551/web.assets_common.js:3991:152)
    at Class.update (http://devappsrvr:8069/web/content/482-fb88551/web.assets_common.js:3988:213)
    at MutationObserver.<anonymous> (http://devappsrvr:8069/web/content/482-fb88551/web.assets_common.js:4008:669)
    at later (http://devappsrvr:8069/web/content/482-fb88551/web.assets_common.js:46:255)

Can anyone tell me what would be causing this and how to fix it?