I get this same error again and again.
[main] [ 2019-06-25 23:39:49.591 IST ] [nativesystem.WindowsNative.Native] InitializeSecurity - successful
[main] [ 2019-06-25 23:39:49.591 IST ] [nativesystem.WindowsNative.Native] Opening registry key...
[main] [ 2019-06-25 23:39:49.591 IST ] [nativesystem.WindowsNative.Native] Key 'Software\Oracle\Olr' does not exist
[main] [ 2019-06-25 23:39:49.591 IST ] [WindowsSystem.isHAConfigured:2098] isOLRConfigured=false
[main] [ 2019-06-25 23:39:49.591 IST ] [ConfigureListener.isHASConfigured:1718] Is Oracle Restart configured: false
[main] [ 2019-06-25 23:39:49.591 IST ] [ConfigureListener.isHASRunning:1747] Is Oracle Restart running: false
[main] [ 2019-06-25 23:39:49.591 IST ] [ConfigureListener.listenerExists:444] Is listener "LISTENER" already exists: true
[main] [ 2019-06-25 23:39:49.591 IST ] [SilentConfigure.performSilentConfigure:214] Typical service alias configuration.
java.lang.NullPointerException
at oracle.net.ca.ConfigureServiceAlias.setEndpoints(ConfigureServiceAlias.java:187)
at oracle.net.ca.ConfigureServiceAlias.buildCommonNSNDescription(ConfigureServiceAlias.java:158)
at oracle.net.ca.ConfigureServiceAlias.typicalConfigure(ConfigureServiceAlias.java:90)
at oracle.net.ca.SilentConfigure.performSilentConfigure(SilentConfigure.java:217)
at oracle.net.ca.InitialSetup.<init>(NetCA.java:4325)
at oracle.net.ca.NetCA.main(NetCA.java:460)