Update app.py

app.py

@@ -70,6 +70,7 @@ def kmeans(ligend,n_clusters,n_num):
     ligend_path = ligend.name
     shutil.copy(ligend_path,pdb_folder)
     n_num = int(n_num)
+    n_clusters = int(n_clusters)
     for i in range(1,n_num+1):
         if i == 1:
             add_file_to_folder(peptide_folder_path,pdb_folder)