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

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at mondrian.olap.RoleImpl.getAccess(
at mondrian.olap.UnionRoleImpl$UnionHierarchyAccessImpl.getAccess(
at mondrian.rolap.RolapHierarchy$LimitedRollupSubstitutingMemberReader.substitute(
at mondrian.rolap.SubstitutingMemberReader.getMemberParent(
at mondrian.rolap.RolapSchemaReader.getMemberParent(
at mondrian.olap.DelegatingSchemaReader.getMemberParent(

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