So you had a working??? kodi running on libreelec installed on a vmware machine and then you tried to add tvheadend?
1. kodi is telling you the database is full, which probably means your disk is full.
2. 127.0.0.1 is a loopback address which always represents the local machine.
3. most likely tvheadend is not running and maybe was not installed completely if the disk is full...
Basically this is NOT a tvheadend issue, but a libreelec problem which would be better to solve at the libreelec forum.
@K Shea, I generally agree, but if he does not know what localhost is, then installing a full distro and packages is probably beyond his current skill level (let alone using any troubleshooting tools...) For MANY people, using a pre-installed image that usually works is just fine.