When select objects to customize, the application hangs, stays in processing status, and shows error below. Could you help me please?
*I searched, but did not find any .bak files in the module
Error: Error: “java.lang.NullPointerException
at java.base/java.util.Objects.requireNonNull(Objects.java:222)
at java.base/java.util.ImmutableCollections$AbstractImmutableList.indexOf(ImmutableCollections.java:166)
at java.base/java.util.ImmutableCollections$AbstractImmutableList.contains(ImmutableCollections.java:197)
at ifs.dev.nb.project.api.BuildHomeFileCacheManager.queryFileInfoImpl(BuildHomeFileCacheManager.java:345)
at ifs.dev.nb.project.api.BuildHomeFileCacheManager.queryFileInfo(BuildHomeFileCacheManager.java:287)
at ifs.dev.nb.project.ui.explorer.SecondaryLocationIx$SecondaryLocationComponentChildFactory.createKeys(SecondaryLocationIx.java:478)
at org.openide.nodes.AsynchChildren.run(AsynchChildren.java:190)
at org.openide.util.RequestProcessor$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)”