How to fix error No: 'noindex' detected in 'X-Robots-Tag'

Hi all
I have indexed my site to google and get error “No: ‘noindex’ detected in ‘X-Robots-Tag’”.
How to remove this header tag ?
Screenshot_3

It may have something to do with this Search engines now blocked from indexing non-canonical pages

thank you
so do i have to rebuild app to apply this merge?

Yes, update to latest.