warning message when I update links

Hi all,
I have this problem: I have a workbook with a formula liniking to another workbook. When I open the workbook, I click on "update links" and then I get this warning message:

"The workbook contains one or more (than one) links that cannot be updated.
* To modify the origin of links, or to look up to update the values again, choose Modify links
* To open the workbook as it is currently , choose To Continue"

I cannot understand where is the problem, the link is updated, state of link is "ok", I even can open the origin from Modifiy menu --> link --> open origin

Is there anyone that can help me?
Thanks a lot