Mobile menu js error

[cmd.developer.team]

We are facing a problem on mobile menu; we can use it without any problem trought all the product pages/list etc while, when we enter the cart summary, the menu doesn't open. We have tried changing the menu modules but we allways have the same  problem.

We are now working with the posmegamenu module and we have found that it is a js error (see below) that we have only on cart pages. 

 Does anybody knows how to handle it?

mobile_menu.js:46 Uncaught TypeError: $(...).mobilemenu is not a function at HTMLDocument.<anonymous> (mobile_menu.js:46) at fire (core.js:690) at Object.fireWith [as resolveWith] (core.js:711) at Function.ready (core.js:745) at HTMLDocument.completed (core.js:748)

	(anonymous)	@	mobile_menu.js:46
	fire	@	core.js:690
	fireWith	@	core.js:711
	ready	@	core.js:745
	completed	@	core.js:748