Group Management approval failed estatus pending

Hi everybody, have a nice new year 2015,

I have an error about approval notifications and the issue is explained below in detail:

Whoever the user (approver) try to approve the requests from FIM portal (fromMy Pending Requests tab), he is getting the "Request Failed" popup. the requests is not getting approved and remains withPending state.
There are no failure requests entries generated in the FIM admin portal (when looking intoSearch requests tab) and the requests remains in Authorizing state which seems like there is a pending approval to complete the request. Because of this, in the fim server, I was unable to identify that the requests are not getting approved (as the FIMADMIN).
The requests are stucked. All the workflows in the stucked requests are left inRunning state.
As a process, If the approvers do not approves the request in 5 days, the request gets expired on the 6th day. I have seen that the stuck requests initiated in last week are not gettingexpired and remains in Authorizing state.
In the fim portal event viewer log , we have seen the below error each time the approvers were trying to approve requests and had got"Request Failed" error pop-up.

My actually versión is 4.1.3419.

Thanks in advanced

Regards

FIM