Admob Not shoing

[ConcaveIT]

Admob ad is showing in DevApp but when i compile it does not show on virtual device or Real device.
Needs help?
Thanks in advance.

[root14]

this seem to be similar to

Admob ionic Ads not showing

While working on a ionic project, i run npm install -g ionic@latest ,after that the app stopped showing ads, im using admob-free plugin in my app, now it is showing a black blank space at banner ads position, it was showing ads untill i upgrade ionic