Toolset does brake on Servers with PHP 7
Update your Toolset to the latest Beta versions / stable versions to come, and use this Errata Page for reference:
This is the technical support forum for Toolset - a suite of plugins for developing WordPress sites without writing PHP.
Everyone can read this forum, but only Toolset clients can post in it. Toolset support works 6 days per week, 19 hours per day.