nnmate, do not modify the LEF as the others suggest. Encounter gives this error "MANUFACTURINGGRID statement was defined before UNITS" when you try to load a tech LEF more than once in one Encounter session. Its not a problem with the LEF, its a problem with how you're loading the LEF. Unless your foundry is totally inept, there should already be a MANUFACTURINGGRID definition in the LEF.
If your foundry really is bad enough to leave out that statement (a severe error), please consult the reference documentation if you have any question about modifying the LEF. The document can be found in <soc install location>/doc/lefdefref and there you will find lefdefref.pdf which will tell you all you need to know about the LEF contents.