SOAPUI-Pro-4.6.4-maven plugin error - message content assert

Hi,

I m getting this following error when i have message content assertion in my project.

Plugin - SOAPUI-Pro-4.6.4-maven plugin.

09:18:22,505 ERROR [AbstractTestRunner] Exception during Test Execution
java.lang.NoClassDefFoundError: com/jgoodies/forms/builder/ButtonBarBuilder
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2493)
at java.lang.Class.getConstructor0(Class.java:2803)
at java.lang.Class.getConstructor(Class.java:1718)
at com.eviware.soapui.impl.wsdl.teststeps.assertions.AbstractTestAssertion

I have used 4.6.4-m-SNAPSHOT version. Now it is showing 'dependencies could not be resolved failed to read artifact descriptor'

Could anyone plz tell me what dependencies i need to add in POM file.

Thanks,
GSKKV