Recently OpenWRT updated to a newer version and mudfish.apk stopped working.
The reason behind it is that version 19.07.0 uses libopenssl version 1.1, while mudfish seeks for files from 1.0.2.
Until mudfish.apk gets updated, I recommend you pre-install this file from their repository via Luci interface then proceed with mudfish installation as normal.
@Mazzocato Thank you for this information. I’ll definitely support OpenVPN 19.07 when they officially release it. When I checked their homepage it seems recently they had released the 2nd release candidate.
Meanwhile I’d created the internal JIRA ticket to follow up this issue.