No class Def found @ ValidationConfigurationBuilder

[rajesh2win]

18 Oct, 2014 6:20:56 AM IST> <MessageDrivenBean threw an Exception in onMessage(). The exception was:
java.lang.NoClassDefFoundError: com/github/fge/jsonschema/cfg/ValidationConfigurationBuilder.
ava.lang.NoClassDefFoundError: com/github/fge/jsonschema/cfg/ValidationConfigurationBuilder
at com.github.fge.jsonschema.cfg.ValidationConfiguration.newBuilder(ValidationConfiguration.java:92)
at com.github.fge.jsonschema.cfg.ValidationConfiguration.byDefault(ValidationConfiguration.java:102)
at com.github.fge.jsonschema.main.JsonSchemaFactoryBuilder.(JsonSchemaFactoryBuilder.java:68)
at com.github.fge.jsonschema.main.JsonSchemaFactory.newBuilder(JsonSchemaFactory.java:123)
at com.github.fge.jsonschema.main.JsonSchemaFactory.byDefault(JsonSchemaFactory.java:113)

[rajesh2win]

Am getting this error while running era in my weblogic .What could be the reason?

18 Oct, 2014 6:20:56 AM IST> java.lang.NoClassDefFoundError: com/github/fge/jsonschema/cfg/ValidationConfigurationBuilder.
ava.lang.NoClassDefFoundError: com/github/fge/jsonschema/cfg/ValidationConfigurationBuilder
at com.github.fge.jsonschema.cfg.ValidationConfiguration.newBuilder(ValidationConfiguration.java:92)
at com.github.fge.jsonschema.cfg.ValidationConfiguration.byDefault(ValidationConfiguration.java:102)
at com.github.fge.jsonschema.main.JsonSchemaFactoryBuilder.(JsonSchemaFactoryBuilder.java:68)
at com.github.fge.jsonschema.main.JsonSchemaFactory.newBuilder(JsonSchemaFactory.java:123)
at com.github.fge.jsonschema.main.JsonSchemaFactory.byDefault(JsonSchemaFactory.java:113)

[Kverma517]

I am getting the same.