SproutForms: "an unknown error occurred" in entries template chart When viewing the charts in the entries template of the SproutForms plugin, I receive an "an unknown error occurred" error message.

In the console, I see this: 

Failed to load resource: the server responded with a status of 500 (Internal Server Error): https://domain.com/index.php?p=admin/actions/sproutForms/charts/getEntriesData

Any clue what's going on here?
Update: This issue has been fixed in Sprout Forms v2.3.0, which also added Entry Status workflows and support for front-end Entries, Categories, and Tags relations fields ;-)

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The issue you’re running into with the Sprout Forms chart is due to your PHP version.  We have it on our list and it should be fixed in the next release.  Until we get that release, the way to fix the issue is to upgrade your PHP version to something higher than PHP 5.4