JCA exception with web logic

Hi All

I'm trying to deploy a JCA implementation into WL 8.1.0.0
From some reason I got the following exception:

"<Jul 24, 2003 1:13:11 AM IDT> <Warning> <Connector> <BEA-190083> <Proxy
test failed. WLS will not use connection proxies for resource adapter
"eis/GigaSpacesCF"
.>"

WL Exception Description:
"The "jndiName" The resource adapter attempted to cast the WLS connection
proxy to a class or an interface not implemented by the proxy and got a
java.lang.ClassCastException (java.lang.ClassCastException). Late
transaction enlistement and leak and idle detection will be turned off for
this resource adapter"

The JCA that I'm trying to deploy support JCA1.1 version.

        Have any one seen this exception before ?
        Any help would be mostly appreciated.

Thanks
Nati S.