Update app.py

app.py

@@ -369,8 +369,8 @@ def completepreprocess(pdffile):
     _bbox, _preds, _words = process_form(pred_list, words, bbox)
     print('page: ' + str(i) + '  ' + str(len(_preds))+ '  ' + str(len(_words)))
     df1, df2 = createDataframe(_preds, _words)
-    dfOne=dfOne.append(df1)
-    dfTwo=dfTwo.append(df2)
+    dfOne=dfOne._append(df1)
+    dfTwo=dfTwo._append(df2)
 
   im2=mergeImageVertical(a)  
   return im2,dfOne,dfTwo