>>> I'm running out of disk space on my Host 6 GB left ...

That may explain the issue. Snapshots contain changed data blocks, i.e. 64kB blocks which have been modified or added.
With only 6GB free disk space, the snapshot consolidation may just run out of disk space (your largest snapshot has a size of ~82GB), because it needs to merge the delta files into the base .vmdk file.

What you need - at least temporarily - is more free disk space, or a lager disk to which you may copy the VM.

André