Update app.py

app.py

@@ -37,7 +37,7 @@ def generate_report(file, type):
     print(contents)
   
     temp_file3 = NamedTemporaryFile(delete=False, suffix=".html")
-    temp_file3.write(report)
+    temp_file3.write(contents.encode('utf-8'))
     temp_file3.close()
        
     return temp_file1.name ,temp_file2.name ,temp_file3.name