Why this show Build failed - Error in the Activity Metadata stage

[sonufahadansari (Review in Hindi)]

Hii any one can help me like I export our application then show me this notification

[dora_paz (Dora)]

This might help

AAPT execution failed, error in Activity Metadata stage

Check your project theme settings, if nothing is shown then select one and try again… [bild]

[sonufahadansari (Review in Hindi)]

I have selected