I updated W3TC only yesterday to 2.1.8 and the following robots.txt error appeared on the screen
FTP credentials don’t allow to write to file /var/www/xxxx/robots.txt
W3C Total Cache Error: Files and directories could not be automatically created to complete the installation.
Please execute commands manually or use FTP form to allow W3 Total Cache make it automatically.
Following is the content of robots.txt
file
# BEGIN W3TC ROBOTS
User-agent: *
Disallow: /wp-content/cache/
# END W3TC ROBOTS
And most importantly, the plugin page becomes completely blank! Then, I had to go use the recovery mode and deactivate the plugin!
According to @vmarko I should have experienced this in the ealier version but most interestingly I never seen this messaage before updating to 2.1.8.
How can I get rid of this issue? I have a feeling that even 2.1.8 could not resolve the issue completely. Is this entirely an error coming from W3TC or other plugins could be responsible for this. If yes, could you figure out yet what might those be? Because this is very important to have the caching working properly!