Where exactly do you see this error? I mean on which step? Could you explain it in a more specific way?

Hello,

The first step for preparing the receptor, when i add HOH* in residue. and when i try to delete it usind edit->delete->delete seleced molecule.

Here is the steps that i followed for preparing the receptor

Select -> Select from String -> (Residue) – HOH* and ( Edit -> Delete -> Delete Set Atom set (to remove water molecules)

It is easier to delete water molecules using any text editor such as vim in CLI or any other alternative. Try to make all the necessary changes to your pdb file using text editors and then load it to ADT using Grid > Macromolecule > Open ...etc

Your water removal step is right. It is the error of incomplete residue (i.e. side chain) in your input file. If it is downloaded from PDB then confirm the said above and re-model the PDB file and then use.