This error can occur if old config files are not properly deleted during an upgrade.
If you see this error when launching OpenVPN after doing a software update please see the steps below to resolve the issue.
Exit the VPN (right click on the icon in the lower right task bar and select exit)
For Windows 64 – C Program Files (x86) – OpenVPN – config
For Windows 32 – C Program Files – OpenVPN – config
Open the config folder and delete all the files.
Now re-install the software.