Bad argument to add item to list when adding Firebase data into list

[Naveen_Patidar]

I am calling data from firebase with the help of tags and I am getting data but it gets error when adding it into list. Bad argument to add item to list.
So Please Help me to Solve This Issue.
Thank You all who giving time to Solve This Issue.

[ADDYLIN]

initialize global title as a empty list

[Naveen_Patidar]

I have done that