Thanks for your reply,
I dont have any spaces in my paths. This is what I found to be the meaning of the error:
# vsim Message # 3261:
> # No module path in a specify block in the related module instance was
> # found to match the SDF construct on the specified line. Verify that
> # the SDF file is being applied to the correct design instance and that
> # a specify block exists in this module instance and contains the
> # appropriate module path. If a COND is being used, verify that the order
> # of the condition is the same in the specify block as it is in the
> # SDF file.
> #
How can I include the appropiate module path in a specify block?