Android Question Hotspot execution fails

I've used the hotspot library posted by Johan Schoeman and minimised the code for posting here. App builds OK and installs OK, but when opened it gives :

Unfortunately, Hotspot has stopped
OK

If I comment out the hs declaration, it executes fine.

I'm running 'old' versions :
B4A 3.5
Core 3.41
Hotspot 1.00

Is there a compatibility issue?

Any ideas? Thanks