This happened only 1 time after the first login.

I deleted App Data to reproduce it, but didn't happened.

workaround:  ** 

restart MC.

NOTE: 

What I did.

1. Unistall MCPE_v1.16.201.
2. Install MCPE_v1.16.210.
3. Open MC (featured Servers not visible)
4. Login.
5. Click the achievement tab( everything ok )
6. Click Server tab(featured Servers not visible).
7. popup Error -3
8. Restart MC.
9. Everything OK ( featured servers VISIBLE).