How do I resolve the 'No thumbnail URL provided' issue in Google console?

How do I resolve the 'No thumbnail URL provided' issue in Google console?

lotuslandhd
Visitor
1 0 1

i got an email from google console about this issue " No thumbnail URL provided" and "Google could not determine the prominent video on the page: i don't know how to fix it 

i appreciate if some body can help me 

Reply 1 (1)

Bananas
Visitor
1 0 0

I'd like to know how to fix this too.