I RPM upgraded kibana to 6.3 from 6.2 and am getting a fatal error preventing kibana from starting up:
{"type":"error","@timestamp":"2018-06-13T22:43:49Z","tags":["fatal"],"pid":10211,"level":"fatal","error":{"message":"Multple plugins found with the id "xpack_main":\n - xpack_main at /usr/share/kibana/node_modules/x-pack\n - xpack_main at /usr/share/kibana/plugins/x-pack","name":"Error","stack":"Error: Multple plugins found with the id "xpack_main":\n - xpack_main at /usr/share/kibana/node_modules/x-pack\n - xpack_main at /usr/share/kibana/plugins/x-pack\n at MergeMapSubscriber.find$.mergeMap.toArray.mergeMap.allSpecs [as project] (/usr/share/kibana/src/plugin_discovery/find_plugin_specs.js:87:15)\n at MergeMapSubscriber._tryNext (/usr/share/kibana/node_modules/rxjs/src/operator/mergeMap.ts:125:21)\n at MergeMapSubscriber._next (/usr/share/kibana/node_modules/rxjs/src/operator/mergeMap.ts:115:12)\n at MergeMapSubscriber.Subscriber.next (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:95:12)\n at ToArraySubscriber._complete (/usr/share/kibana/node_modules/rxjs/src/operator/toArray.ts:38:22)\n at ToArraySubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)\n at MergeMapSubscriber._complete (/usr/share/kibana/node_modules/rxjs/src/operator/mergeMap.ts:141:24)\n at MergeMapSubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)\n at RefCountSubscriber.Subscriber._complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:144:22)\n at RefCountSubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)\n at Subject.complete (/usr/share/kibana/node_modules/rxjs/src/Subject.ts:91:15)\n at ConnectableSubscriber.Subscriber._complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:144:22)\n at ConnectableSubscriber._complete (/usr/share/kibana/node_modules/rxjs/src/observable/ConnectableObservable.ts:82:20)\n at ConnectableSubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)\n at DistinctSubscriber.Subscriber._complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:144:22)\n at DistinctSubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)\n at MergeAllSubscriber.notifyComplete (/usr/share/kibana/node_modules/rxjs/src/operator/mergeAll.ts:106:24)\n at InnerSubscriber._complete (/usr/share/kibana/node_modules/rxjs/src/InnerSubscriber.ts:26:17)\n at InnerSubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)\n at CatchSubscriber.Subscriber._complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:144:22)\n at CatchSubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)\n at MergeMapSubscriber.notifyComplete (/usr/share/kibana/node_modules/rxjs/src/operator/mergeMap.ts:173:24)\n at InnerSubscriber._complete (/usr/share/kibana/node_modules/rxjs/src/InnerSubscriber.ts:26:17)\n at InnerSubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)\n at CatchSubscriber.Subscriber._complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:144:22)\n at CatchSubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)\n at MapSubscriber.Subscriber._complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:144:22)\n at MapSubscriber.Subscriber.complete (/usr/share/kibana/node_modules/rxjs/src/Subscriber.ts:122:12)"},"message":"Multple plugins found with the id "xpack_main":\n - xpack_main at /usr/share/kibana/node_modules/x-pack\n - xpack_main at /usr/share/kibana/plugins/x-pack"}