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Exception in thread "main" java.lang.IllegalArgumentException

i just want to run the client of Beta 1.7.3 and Exception in thread "main" java.lang.IllegalArgumentException: Unsupported class file major version 68 at org ...
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Exception in thread "Thread-211" java.lang.RuntimeException: Cannot instantiate class.

org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer [] - Kryo serializer scala extensions are not available. Exception in thread "Thread-211" java.lang ...