Error "cannot read points array from Points in piece 0. The data array in the element may be too short"

Hello everyone,
I face an error (cf. joined image) with the joined pvd files when i try to open them (when i click on “apply”): “cannot read points array from Points in piece 0. The data array in the element may be too short”.
I do not know why i have this error, as it appears quite randomly in my program.
Could someone check the files and indicate me what is the issue and how to fix it?

Pvd_files.rar (133.0 KB)

Best,
Francois.