Cube start failed XQE ROL-0016

XQE-ROL-0016 More than one member was found in [Stucture article].[Structure Article].[Code Interne Sous Sous Famille] with member key values [350011].[351414].[350305].[350065].[ARABICAS MOULUS]. Member [350011].[351414].[350305].[350065].[ARABICAS MOULUS] could already have a parent of [], or there might be duplicate member keys. Duplicate member key values for different level keys may occur if an insufficient number of level key columns are defined in each level during modeling. This requires a fix to the model.

Any solution to this problem experts ?