Invalid keystore format error after xpack installed

environment: macos
es version: 5.2.2
jdk: 1.8.0_92

before xpack was installed, the elastic runs fine.

but after xpack installation, i get such error outputs:

[2017-03-16T14:53:18,593][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: ElasticsearchException[Failed to load plugin class [org.elasticsearch.xpack.XPackPlugin]]; nested: InvocationTargetException; nested: ElasticsearchException[failed to initialize a TrustManagerFactory]; nested: KeyStoreException[problem accessing trust Invalid keystore format];

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