minimserver fails to start

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I discovered that my minimserver daemon wasn't running. But it will not start and I am getting the following errors

Code:

java.lang.ClassFormatError: Incompatible magic value 4294967295 in class file sun/util/calendar/ZoneInfoFile$Checksum
        at java.base/sun.util.calendar.ZoneInfoFile.getZoneInfo(ZoneInfoFile.java:729)
        at java.base/sun.util.calendar.ZoneInfoFile.getZoneInfo(ZoneInfoFile.java:375)
        at java.base/sun.util.calendar.ZoneInfoFile.getZoneInfo0(ZoneInfoFile.java:138)
        at java.base/sun.util.calendar.ZoneInfoFile.getZoneInfo(ZoneInfoFile.java:114)
        at java.base/sun.util.calendar.ZoneInfo.getTimeZone(ZoneInfo.java:588)
        at java.base/java.util.TimeZone.getTimeZone(TimeZone.java:577)
        at java.base/java.util.TimeZone.setDefaultZone(TimeZone.java:682)
        at java.base/java.util.TimeZone.getDefaultRef(TimeZone.java:653)
        at java.base/java.util.TimeZone.getDefault(TimeZone.java:642)
        at java.base/java.util.Calendar.defaultTimeZone(Calendar.java:1679)
        at java.base/java.util.Calendar.getInstance(Calendar.java:1660)
        at java.base/java.text.SimpleDateFormat.initializeCalendar(SimpleDateFormat.java:676)
        at java.base/java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:620)
        at java.base/java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:599)
        at org.jminim.mlaunch.MinimLaunch.<clinit>(MinimLaunch.java:65)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.ja​va:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccesso​rImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at org.jminim.launch.Launcher.launch(Launcher.java:88)
        at com.minimserver.launch.LaunchServer.main(LaunchServer.java:34)
MinimServer: error calling MinimLaunch.launch: java.lang.ClassFormatError: Incompatible magic value 4294967295 in class file sun/util/calendar/ZoneInfoFile$Checksum

I have been looking around, and some suggest I should clean the cache, but I have no clue where and how to do that,
This is on a Raspberry Pi3, with raspbian linux.

Charles