Resized disk, now get "mdadm: No arrays found in config file"

[JAS38]

I reszied a guest LVM Thin Pool using these steps:

1. lvresize
2. lvestend
3. qm resize
4. gparted

Now I get this error message on Linux guest boot:

mdadm: No arrays found in config file or automatically

Is there a fix for this?
Did I corrupt my Linux guest partition?
I'm now wondering if I can't use gparted on LVM volumes.