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Spark 2.5.8 Can't find registry file

Hi all

eror.log

java.lang.reflect.InvocationTargetException

Exception on commit = java.io.IOException: Can’t find registry file

Exception on commit = java.io.IOException: Can’t find registry file

Exception on commit = java.io.IOException: Can’t find registry file

Exception on commit = java.io.IOException: Can’t find registry file

java.net.UnknownHostException: stun.xten.net

at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)

at java.net.InetAddress$1.lookupAllHostAddr(Unknown Source)

at java.net.InetAddress.getAddressFromNameService(Unknown Source)

at java.net.InetAddress.getAllByName0(Unknown Source)

at java.net.InetAddress.getAllByName0(Unknown Source)

at java.net.InetAddress.getAllByName(Unknown Source)

at java.net.InetAddress.getByName(Unknown Source)

at de.javawi.jstun.test.DiscoveryTest.test1(DiscoveryTest.java:90)

at de.javawi.jstun.test.DiscoveryTest.quickTest(DiscoveryTest.java:75)

at de.javawi.jstun.test.demo.ice.ICENegociator$1.run(ICENegociator.java:77)

at java.lang.Thread.run(Unknown Source)

What is it?
help please!