spservices raising an error as soon as I try to use functions

Question

I'm currently trying to use SPServices to get the current user who accesses the page. My problem there is that I always get "Syntax error, unrecognized expression" when I try to do that.

The code which throws the error is:

var thisUserAccount = $().SPServices.SPGetCurrentUser({
    fieldName: "Name",
    debug: false
});

The same error occurs when I do the following

alert($().SPServices.SPGetCurrentUser());

I'm using: jquery.SPServices-2014.01.min

When I use the developer tools from IE and put in watchpoints I see that SPServices exists and SPGetCurrentUser also exists. if I use:

alert($().SPServices.SPGetCurrentUser);

I get the whole prototype for that SPGetCurrentUser printed into the alert.

So it is not undefined. Now my question is though what am I doing wrong there so that I can't use that function (the error message shows nothing else aside from unrecognized expression and doesnt go into details WHAT the expression in question is).

Edit: A small detail var thisSite = $().SPServices.SPGetCurrentSite(); works in as that it does not throw any errors BUT when I use alert(thisSite) it shows an empty string.

And with a bit of testing around I just saw that:

var lastId = $().SPServices.SPGetLastItemId({ 
    listName: "MyListName"
}); 

throws the same Error as SPGetCurrentUser (at least if I give no userAccount data.....if the userAccount data is given then no error is thrown).