Notification Icon is white/grey

Hey guys, I have a problem regarding notifications in flutter app! I have a white/grey image icon appearing problem. I have tried everything including changing manifest files or adding icons in notification function itself but seems like I am doing something wrong somewhere. I need some help

![Screenshot 2020-07-17 15.29.35|690x388](upload://2kPUlb32MhIRDOPTR1jMAyW1tJp.png)

Can you upload your screenshot again?
It is missing.

Thanks.