Null exception append range

Help
1

I am getting error at appending the data as null …
but excel has data …
please refer my below workflow and input output files.demo.zip (32.2 KB)

2

Try this
demo.zip (53.8 KB)

3

Thank u very much …but there is version problem can u please share the screenshot…

4

Use append range for excel activities by using application scope for output then try