While starting task I am getting “Please defer the active task first ” error. What do I do? (iOS)

You are getting this error because there is an active task present in your pending task, which can be seen on the top of all pending tasks. 

1. Swipe the task from right to left

2. You will get defer option, click on "defer"


3. Now compose new task by tapping + icon OR tap on start a pending task.