Excel import issue

Hello Team, I am getting following error while importing data from excel.   The following error occurred when importing document: Solution.xlsxcom.mendix.replication.MendixReplicationRuntimeException - Invalid object key located, retrieved all objects for object:Solution_DeputyManager but found an object with an unexpected key: xxxx|KEY| | VERSION: Mx5_20161013.   I am using excel importer module version 10.4.0 and using .xlsx file to import.   Please give some solution. 
1 answers

What type of import do you use in terms of create a new object for every line, synchronize or another method?