Did you validate including the define.xml? I ask as I have seen this message popping up a few times even when no define.xml was included.
If you did validate including the define.xml, and at first glance, it looks to me from the image (that you attached) that you don’t have a “Description” with the label in the define.xml for the ValueList ItemDef with Name=“RESCUMED”.
It should e.g. be something like:
This is the label for RESCUMED
<def.Origin … >…</def:Origin>
There might however also be another cause …
And yes, this has indeed nothing to do with CT for QLABEL, but as I said, I have seen this message popping up several times when there was another cause.
You can of course always contact me by e-mail in case you would like me to inspect your define.xml (without charge ;-)), my e-mail is easy to find out …