NetVault has been created and appears to be ok. vRanger 5.3 or better is installed with no problems, but unable to create a repository. The drop-down for displaying the repository directory is empty. You may or may not have created attempted to resolve by creating a share.
The documentation for how to actually create the repo directory is unclear. If you have created a share, delete it as it is unnecessary.
Simply type the name of a the directory that you wish to use for the repository into the dropdown. The directory will be created and repository should then be mounted as a usable vRanger repository.