Can't load Open VDB Sequence from Embergen

I always get this message when loading Open VDB smoke and fire sequences from Embergen.

I tried to load free VDB sequences from this link:

Single Open VDB file loads fine (non-sequence)

Am I doing something wrong?

/edit: apparently some of the free sample files work fine, I guess there is something wrong with Embergen export with those that don’t work?

Thank you