Teamspeak stopped working

[linde03]

My Teamspeak stopped working after several years of no issues.
Checked firewalls, port forwarding, tec but can't find anything wrong.
reinstalled several time. No success.
Did the copy paste with fresh downloaded version teamspeak download center.
Below is the loging I get:
2020-03-21 20:08:16.129622|INFO |ServerLibPriv | |TeamSpeak 3 Server 3.9.1 (2019-07-02 13:17:23)
2020-03-21 20:08:16.130042|INFO |ServerLibPriv | |SystemInformation: Linux 4.14.x #1 SMP Fri Mar 6 00:38:15 CST 2020 x86_64 Binary: 64bit
2020-03-21 20:08:16.130107|WARNING |ServerLibPriv | |The system locale is set to "C" this can cause unexpected behavior. We advice you to repair your locale!
2020-03-21 20:08:16.130154|INFO |ServerLibPriv | |Using hardware aes
2020-03-21 20:08:16.132054|INFO |DatabaseQuery | |dbPlugin name: SQLite3 plugin, Version 3, (c)TeamSpeak Systems GmbH
2020-03-21 20:08:16.132163|INFO |DatabaseQuery | |dbPlugin version: 3.11.1
2020-03-21 20:08:16.132705|INFO |DatabaseQuery | |checking database integrity (may take a while)
2020-03-21 20:08:16.219976|INFO |SQL | |db_CreateTables() tables created
2020-03-21 20:08:16.433600|WARNING |Accounting | |Unable to open licensekey.dat, falling back to limited functionality
2020-03-21 20:08:16.433887|CRITICAL|Accounting | |Failed loading default license file!

Anybody any ideas?