Trouble running wls-maven-plugin goal appc

 Hello.

I'm trying to use the wls-maven-plugin appc goal for compiling an ear. I get the following error

[INFO] --- wls-maven-plugin:12.1.1.0:appc (wls-compile) @ app-ear ---

[INFO] ++====================================================================++

[INFO] ++  wls-maven-plugin: appc                                            ++

[INFO] ++====================================================================++

<2012-okt-15 kl 20:32 CEST> <Error> <J2EE> <BEA-160142> <The library at c:\app\target\app-ear\APP-INF\lib\javassist-3.14.0-GA.jar has an illegal Specification-Version: 3.14.0.GA. The Specification-Version must be a valid version string: int(.int)*, int >=0; for example: 2.1.1>

<2012-okt-15 kl 20:32 CEST> <Error> <J2EE> <BEA-160144> <Failed to register library Extension-Name: jgroups-2.10.0.Beta2, Implementation-Version: 2.10.0.Beta2:Library cannot have Implementation-Version set, without also specifying its Specification-Version>

<2012-okt-15 kl 20:32 CEST> <Info> <J2EE> <BEA-160186> <Compiling EAR module "app-ejb-1.0.jar">