Object reference not set to an instance of an object

Object reference not set to an instance of an object.
I am getting this error in Automation . I have "Select to File" Task and it throws me this error.

It worked last week after i upgraded to 5.2 and suddenly seeing this message from today.

Thanks

Hi,
"Object reference not set to an instance of an object." is a very common and very general error. We can only guess until you send us more info like exception trace and a screenshot.
Just to be sure, can you check whether all the files referenced in the Automation script are where they should be and that Toad can access them?