remove of an item returns this.getitem is not a function

[bryanrasmussen]

I want to update the value of an item, I am not finding it possible to do this so I decided to remove it and write it again, in looking at that I got the following error

which returns
TypeError: this.getItem is not a function
...key,fn,scope){var val;key=this.key(key);val=this.getItem(key);this.store.removeI...
I narrowed down and found I just couldn't remove the item.

It is the correct data store and item I referring to.

I can provoke this with something as simple as

var store = new Persist.Store('external_img_store');
store.remove("urls");

however If I do
store.get('urls', function (ok, val) {
var currenturl_list;
if (ok) {
currenturl_list = val.split(",");
console.log(currenturl_list);
}
});

I see all the urls I have stored in there.

Any ideas?