Problems with frontend installation. Related to packages versions.
Problem 1
dotkernel/dot-event v0.2.1 requires zendframework/zend-eventmanager ^3.2 -> satisfiable by zendframework/zend-eventmanager[3.2.0, 3.2.1, 3.3.x-dev, 3.2.x-dev] but these conflict with your requirements or minimum-stability.
dotkernel/dot-mail 1.0.0 requires dotkernel/dot-event ^0.2.1 -> satisfiable by dotkernel/dot-event[v0.2.1].
Installation request for dotkernel/dot-mail 1.0 -> satisfiable by dotkernel/dot-mail[1.0.0].
Problems with frontend installation. Related to packages versions.
Problem 1