Probably a bug

Your software
My Mautic version is: 3.2.4
My PHP version is:
My Database type and version is: mysqlnd 5.0.12-dev

Your problem
My problem is: I am getting this below given error screen when i try to add SEND AN EMAIL

These errors are showing in the log:

Steps I have tried to fix the problem:

Plz publish your logs (Config - System - logs) so we can help!