Due to several other dependencies we have chosen to upgrade JIRA to 6.1.7. The advisory indicates that this version of JIRA has been fixed, and almost all of our plugins are supported in 6.1.7.
So I'm answering the question by changing the requirements. Upgrading to 6.1.7 fixes the problem and Simple Calendar works in that version.
are you speaking about simple calender plugin(https://marketplace.atlassian.com/plugins/ru.mail.jira.plugins.mailrucal)? if yes then you need to check with plugin vendor, you can submit support request at
or you can find plugin author details here
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