java.lang.ClassCastException: java.base/java.net.URL cannot be cast to org.openide.loaders.DataObject
   at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrors(HintsControllerImpl.java:93)
   at org.netbeans.spi.editor.hints.HintsController$1.run(HintsController.java:84)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.ClassCastException: java.base/java.net.URL cannot be cast to org.openide.loaders.DataObject
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:420)
   at org.netbeans.spi.editor.hints.HintsController.setErrors(HintsController.java:82)
   at org.netbeans.modules.spellchecker.ComponentPeer.computeHint(ComponentPeer.java:696)
   at org.netbeans.modules.spellchecker.ComponentPeer.access$200(ComponentPeer.java:126)
   at org.netbeans.modules.spellchecker.ComponentPeer$3.run(ComponentPeer.java:189)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)