problem after upgrading 4.0.1 -> 4.1.3: java.lang.VerifyError

[Mark Prins]

Many of my servlets that worked under 4.0.1 are complaining with:
java.lang.VerifyError: (class:
com/caris/fusion/servlet/JDMC_FusionServletBase, method: init signature:
(Ljavax/servlet/ServletConfig;)V) Incompatible object argument for function
call

Any thoughts on this?

Mark