There are some maps containing DTree. GetUnit functions working fine with SP2. After installing SP3 they work fine as it should be. However, if the maps are re-compiled with SP3 then the following errors are found at the time of compilation:

The possible reason for the error may be change in the datatree API when passing from SP2 to SP3.

Replace the DataTree.GetUnit($param1) with DTREE.GetUnit($dtreeH,$param1)