We lost our group in the application Viber. This happened when we installed the latest version IOS9 in our iPad mini. This didn't happen quickly, it occurred maybe a couple days later. Before that, we used the group every single day without no problem whatsoever.
When the new version of Apple operating system arrived or was notified, we proceeded to install it in our iPad mini.
How can we recover Viber group in our iPad?
(Please note that we only had one group in Viber we didn't have more than one)