java.lang.IllegalArgumentException: Illegal group reference

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Illegal group reference
java.lang.IllegalArgumentException: Illegal group reference
at org.apache.james.jspf.core.MacroExpand.expandMacroString(MacroExpand.java:280)
at org.apache.james.jspf.core.MacroExpand.expandDomain(MacroExpand.java:231)
at org.apache.james.jspf.core.MacroExpand.expand(MacroExpand.java:178)
at org.apache.james.jspf.core.MacroExpand.checkExpand(MacroExpand.java:162)
at org.apache.james.jspf.terms.ExistsMechanism.checkSPF(ExistsMechanism.java:74)
at org.apache.james.jspf.executor.SynchronousSPFExecutor.execute(SynchronousSPFExecutor.java:54)
at org.apache.james.jspf.impl.SPF.checkSPF(SPF.java:332)

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