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core dump
How do I fix this:
Internal exceptions (10 events):
Event: 166.633 Thread 0x73e08830 Exception <a 'java/lang/ClassNotFoundException': com/vaadin/shared/ui/button/ButtonStateCustomizer> (0x63e6b9e8) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 210]
Event: 166.678 Thread 0x73e08830 Exception <a 'java/lang/ClassNotFoundException': com/vaadin/shared/ui/textfield/AbstractTextFieldStateBeanInfo> (0x63e8b640) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 210]
Event: 166.699 Thread 0x73e08830 Exception <a 'java/lang/ClassNotFoundException': com/vaadin/shared/AbstractFieldStateBeanInfo> (0x63ea01b0) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 210]
Event: 166.721 Thread 0x73e08830 Exception <a 'java/lang/ClassNotFoundException': com/vaadin/shared/AbstractFieldStateCustomizer> (0x63eb51f8) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 210]
Event: 166.748 Thread 0x73e08830 Exception <a 'java/lang/ClassNotFoundException': com/vaadin/shared/ui/textfield/AbstractTextFieldStateCustomizer> (0x63ecfa58) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 210]
Event: 184.225 Thread 0x73e07bc0 Exception <a 'java/net/SocketTimeoutException': Read timed out> (0x641ff588) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/prims/jni.cpp, line 735]
Event: 184.226 Thread 0x63402590 Exception <a 'java/net/SocketTimeoutException': Read timed out> (0x641ff830) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/prims/jni.cpp, line 735]
Event: 184.227 Thread 0x002ef900 Exception <a 'java/net/SocketTimeoutException': Read timed out> (0x641ffbf0) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/prims/jni.cpp, line 735]
Event: 185.279 Thread 0x6065a588 Exception <a 'java/lang/ClassNotFoundException': com/vaadin/shared/MouseEventDetailsBeanInfo> (0x63e5c6f0) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 210]
Event: 185.301 Thread 0x6065a588 Exception <a 'java/lang/ClassNotFoundException': com/vaadin/shared/MouseEventDetailsCustomizer> (0x63e71690) thrown at [/build/openjdk-8-2oJtqp/openjdk-8-8u66-b01/src/hotspot/src/share/vm/classfile/systemDictionary.cpp, line 210]