Exception installing nb-javac

Today NB asked to reinstall nb-javac, maybe due to the fact that my PC crashed yesterday, while the IDE was open.

After download I got this error:

java.lang.IllegalStateException: Host module StandardModule:org.netbeans.libs.javacimpl jarFile: /home/sw/netbeans-11.1/java/modules/org-netbeans-libs-javacimpl.jar was enabled before, will not accept fragment StandardModule:org.netbeans.modules.nbjavac.impl jarFile: /home/dusty/.netbeans/11.1/modules/org-netbeans-modules-nbjavac-impl.jar
at org.netbeans.ModuleManager.attachModuleFragment(ModuleManager.java:1104)
at org.netbeans.ModuleManager.maybeAddToEnableList(ModuleManager.java:1708)
at org.netbeans.ModuleManager.maybeAddToEnableList(ModuleManager.java:1721)
at org.netbeans.ModuleManager.simulateEnable(ModuleManager.java:1632)
at org.netbeans.ModuleManager.simulateEnable(ModuleManager.java:1605)
at org.netbeans.core.startup.ModuleList.installNew(ModuleList.java:289)
at org.netbeans.core.startup.ModuleList.access$2400(ModuleList.java:93)
at org.netbeans.core.startup.ModuleList$Listener.stepEnable(ModuleList.java:1384)
at org.netbeans.core.startup.ModuleList$Listener.access$1400(ModuleList.java:982)
at org.netbeans.core.startup.ModuleList$Listener$1.run(ModuleList.java:1206)
at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:102)
at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:494)
at org.netbeans.core.startup.ModuleList$Listener.run(ModuleList.java:1182)
at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)