New Twitter Timeline widget gives error messages

I have just switched over to Jetpack Twitter Timeline, and while the widget seems to work just fine now that I’ve discovered which number to enter into it, I’m still getting an error message at the top of my website Spun Stories
Here is what it says:
Warning: Invalid argument supplied for foreach() in /home/cynthiahaggard/spunstories.com/wp-content/plugins/wp-twitter-timeline/wp-twitter-timeline.php on line 236

I have no idea what this means. Could you please help as I don’t want to see an error message on my website.

Thanks!

Cynthia