Cannot Select Activities

Followed install instructions under "Install" on https://github.com/hicknhack-software/redmine_time_tracker

I have Redmine 2.3.1-3

I click on "Time Tracker" in Redmine, select a task in the "Specify your current task" field and hit "Start". Timer starts and lets me select any of the options except for "Activities". The "Activities" dropdown menu neither lets me type an activity nor does it show any activities. As a result, I cannot stop the timer.

Despite this, I can select the "Active Trackers" tab and delete the timer.

Am I missing something? How do I specify an activity?

该提问来源于开源项目：hicknhack-software/redmine_time_tracker