Life Remnants "not usable with current weapon settings"

I'm playing a Blood Mage, so I got Life Remnants as a Buff. However, for some time now I have the error message "not usable with current weapon settings" on that buff.

I un-equipped my equipment and all my gems but the error message is still there. The life remnants appear in the game as well but the support gems I usually slot in there do not seem to work properly.

Is there any way to fix this?