What is the wrong with blocks?

[vknow360 (Sunny Gupta)]

I am using firebase because I have to make a chat app.How can I use airtable with chatview?

Need some help related firebase!

I am making an app for chat. I basically used chatview but I have captured an error after compiling apk. I have been working on it for three days but couldnot found any solution. The error is very strange for me. I used firebase to get chat. I gets but adds received chat not send chat two times. [BlueStacks_ScreenShot] As you can see in screenshot. Can anyone tell me the solution?