How long have you had this problem?
If already 2-3 days, then try updating first.
2nd option would be delete, re-install.
Won't hurt to send message to Sololearn now as it will take some time before they respond.
I just looked at your profile which shows activity for the last 11 days.
If you have always had this problem, then that could indicate a bad upload.
If it happened more recently, then possible upgrade issue