Record is unavailable

[manlia]

I tried to add a lead for the third time, and getting the
error "Record is unavailable". And, when I looked at the
Evenet viewer and MS CRM platform error, it said
that "THE SPECIFIED Object was NOT FOUND".

I have check on the security/roles, and they're okay
which means. any roles I used, it still giving the same
problem on that particular machine. Other machine is
fine although it has the same rights and logging into the
same server.

Please help.
Thanks
Lia