The message says:
Edit file /XXXXXX/.htaccess and remove all lines between and including # BEGIN W3TC Page Cache and # END W3TC Page Cache markers.
But the .htaccess File in XXXXXX does not contain this string! There is only this string:
# BEGIN W3TC Page Cache core
...
# END W3TC Page Cache core
I also have no path wp-content/cache/page_cache/.htaccess, only wp-content/cache/page_enhanced/.htaccess. And there is only this string:
# BEGIN W3TC Page Cache cache
...
# END W3TC Page Cache cache
I've tried everything, still get the message. :-(
What to do?
BTW: I have a htpasswd-protection (it's a test-site), does it have to do with it?