package 'ENV_BioticsLab_TWO_MAT' failed?

when i try hosting a Dedicated Server
Connection Lost > Downloading package 'ENV_BioticsLab_TWO_MAT' failed: Error opening file

Spoiler!

This is the only issue holding me back from hosting, i've uninstalled everything and reinstalled back twice, game and server files

package 'ENV_BioticsLab_TWO_MAT' failed?