Urgent please, what does this error mean( IncompatibleClassChangeError)?

[Jose Euclides da Silva Junior - DATAPREVRJ]

Hi guys,
the following error message have been coming since my (servlet) controller
started to deal with an optional multipart-form/data . Any kind of help
would be appreciated.
Regards, Euclides.


java.lang.IncompatibleClassChangeError
        at BancoServlet.init(BancoServlet.java:50)
        at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:93
4)
        at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:666)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:214)
        at org.apache.catalina.core.StandardPipeline

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