Update utils/helpers.py

utils/helpers.py

@@ -109,7 +109,7 @@ def get_all_metalbinding_resids(pdb_file):
     """
 
     try:
-        prot = Molecule(pdb_file)
+        prot = Molecule('files/2CBA.pdb')
     except:
         exit("could not read file")
     prot.filter("protein")