Hello Koders 
Hope you are doing well in your projects 
I am posting here due to a problem i encountered while testing my Chat App i’m making using Firebase DB and some extensions, the problem is that the Chatview don’t show anything even if i disable every block and enable just one to add a message to the Chatview on screen initialisation i don’t see anything, also the second problem is this error:
Select list item: Attempt to get item number 0, of the list (). The minimum valid item number is 1.
And when i send a message:
Select list item: Attempt to get item number 0, of the list (("Hi","","","") ("Hello","","","")). The minimum valid item number is 1.
Please help me in these two problems and thanks a lot 
This guide may help you
1 Like
Thanks but first i don’t want a ready example i want to make something by myself so i understand it well and i will buy this app so i don’t want to get money from something i found ready Second reason is that my problem is with the chatview it don’t work proprely 
when exactly do you get that error? look especially at the select list item blocks…
use Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools
where in your blocks are you sending something? again, debug your blocks…
Taifun