WordPress Multisite update caused fatal error

Greetings!

I just upgraded my WordPress Multisite to 4.7, and have Jetpack running v.4.4.2., and I am running PHP 5.5 on my website at https://trenchbucket.com.

When I completed the update, suddenly my Website Stats that come through my connection with www.ads-software.com kicked out this error message:

Fatal error: Call to undefined function cconover\FeaturedImageCaption\register_api_field() in [myWebSite]/wp-content/plugins/featured-image-caption/classes/RestApi.php on line 23

I uninstalled, and reinstalled — now the error message no longer appears in the Stats box on the dashboard, but if I click the “Connect Jetpack” button, it kicks the error again.

All my other sites that are NOT multisite do not have this problem and my other WPMS does not have this problem — only THIS WordPress Multisite has this problem.

So I’m stumped!

Any ideas?

Cheers,
Kyle