Could you please tell me why am I getting this error " No atom selected: "name O and chain W and resname HOH and resseq 69". 
============================= Scattering factors =============================
                ----------X-ray scattering dictionary----------                
Number of scattering types: 7
  Type  Number    sf(0)   Gaussians
   Zn2+     1     27.88       1
   S       10     15.96       2
   P        2     14.95       2
   Mg2+     3      9.96       1
   O      635      7.97       2
   N      523      6.97       2
   C     1983      5.97       2
  sf(0) = scattering factor at diffraction angle 0.
========================== Anomalous scatterer groups =========================
All atoms refined with f_prime=0 and f_double_prime=0.
======================== Summary of geometry restraints =======================
  Number of disulfides: simple=0, symmetry=0
  Custom bonds:
Sorry