[Minify] A group configuration for "include" was not set

Hi

Since a few days I installed W3TC, and started using the minify feature, first in manual mode then in automatic mode.

I keep seeing this message

Recently an error occurred while creating the CSS / JS minify cache: A group configuration for “include” was not set.

I even recive an annoying email every now and then saying that there has been a problem

I know this has been asked in other topics but in most of them there is actually no answer to this problem…

Pleas could you help me?

Nicolas.

https://www.ads-software.com/plugins/w3-total-cache/