Regarding this message, I think it is only a warning rather than a critical error. However, the disallow directive should specify:
Disallow: /cache/
This is fixed in master but has never been backported to 2.x.
Regarding this message, I think it is only a warning rather than a critical error. However, the disallow directive should specify:
Disallow: /cache/
This is fixed in master but has never been backported to 2.x.