[Observium] Can't run svn update

We have the pro license subscription, but every time I try to run a svn update, I receive this:

Skipped '.' svn: E155007: None of the targets are working copies

Here's the Version Information: Observium

18.7.9334 (10th July 2018)

OS

Linux 4.15.0-43-generic [amd64] (Ubuntu 18.04)

Apache

2.4.29 (Ubuntu)

PHP

7.0.32-0ubuntu0.16.04.1 (OPcache: ENABLED)

Python

2.7.15rc1

MySQL

5.7.24-0ubuntu0.18.04.1 (extension: mysqli 5.0.12-dev)

SNMP

NET-SNMP 5.7.3

RRDtool

1.7.0

Fping

4.0 (IPv4 and IPv6)

Any ideas?

Tom