Rntime error with firebase

[punjabiamv (aa bb)]

[hammerhai (Nathan)]

The error shows the solution.

[punjabiamv (aa bb)]

I can’t understand where to edit and what to edit can you please explain me properly

[Ali_Aydin (Pme)]

Why you dont understand error.Its say you try store a value with unacceptable words like., # $

You cant use # $., on tag

[David (‎ David Ningthoujam)]

Just don’t store device ID as a tag in firebase. It will solved.