After configuring the wio link board, I can see there is 1 node in my Android App.
Clicks on it and the app crashes. See the screen cap below. (replace [dot] with . because I can’t post link…)
imgur[dot]com/YuCF23t
imgur[dot]com/xALTgEt
Clicks on Api or Setting cause app crash too.
Tried my 2nd wio link board. Also same. 
Could your log more info about your phone and OS version?
And, pls update Wio Link app to 2.2.0.
Yes I am already using 2.2.0 (Latest from play store)
I am using a Note 4, android 5.1.
It happens when I tap on any nodes on the screen. (I have 2 nodes)
The stack trace is pointing to:
IndexOutOfBoundsException Invalid index 0, size is 0.
at cc.seeed.iot.ui_setnode.SetupIotlinkActivity.java:123
I had the same problem on a Nexus 5 with Android 6.0.1.
After deleting and reinstalling the app, the problem is solved for me.
I hope this will help you.
It seems like previously the app does not get a list of groves. (For unknown reason…)
After uninstall and install, it can get the list and hence the app does not crashes anymore.
Thanks! 