I have observed the following error a few times (on older builds as well), however I cannot determine if this is a user error or bug in the service. Once the issue triggers you can observe it happening repeatedly.
I cannot provide the steps to reproduce the issue. But here's a general idea of the steps I took today.
1. Used vagrant to create VMs with couchbase-server 7.0.0-3435.
2. During one of the two tests I was writing today, I provisioned 3 nodes into a cluster which succeeded and attempted to add a repository which failed.
The shared directory is working as intended, the shared directory has been succesfully shared between all of the clients.