in function "remove" I had the error "error: elem.className has no properties" so I added the line:

if(!elem.className)return;

into the function:

remove: function( elem, c ){

if(!elem.className)return;

elem.className = c != undefined ?

jQuery.grep( elem.className.split(/\\s+/), function(cur){

return !jQuery.className.has( c, cur );

}).join(" ") : "";

},

I couldnot reproduce the Error, but using that Change helped.