The distribution 4.15 of Minyaa has been built using wrong dependencies on Alkaes JIRA Plugin - Commons .
The 1.14 hs been used instead of 1.16.
It blocks a part of Minyaa Plugins in their activation.
If you have installed before Minyaa Time, Minyaa Workflows, Minya Predefined Reports or Alkaes User Security , then you have the correct version of Alkaes JIRA Plugin - Commons.