java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at mondrian.olap.RoleImpl.getAccess(RoleImpl.java:312)
at mondrian.olap.UnionRoleImpl$UnionHierarchyAccessImpl.getAccess(UnionRoleImpl.java:167)
at mondrian.rolap.RolapHierarchy$LimitedRollupSubstitutingMemberReader.substitute(RolapHierarchy.java:936)
at mondrian.rolap.SubstitutingMemberReader.getMemberParent(SubstitutingMemberReader.java:183)
at mondrian.rolap.RolapSchemaReader.getMemberParent(RolapSchemaReader.java:111)
at mondrian.olap.DelegatingSchemaReader.getMemberParent(DelegatingSchemaReader.java:52)

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