Asset import

Hello everyone,

I am trying to import assets using a template downloaded from WHD in Excel format but I am having this error message:

Can someone be kind to help 

java.lang.IllegalArgumentException: The header contains a duplicate entry: 'Purchase Date' in [Asset No., Asset Type, Manufacturer, Model, Version, Status, Serial Number, IP Address, Network Name, MAC Address, Location, Client (user names, semicolon delimited), Purchase Date, PO Number, Vendor, Cost, Audit Date, Service Contract? (Y/N), Contract Expiration Date, Billing Rate Name, Notes, Warranty Type, Child Asset? (Y/N), Related Asset Sync Keys, Multi-Install? (Y/N, Child Assets only), Install Count (Child Assets only), Reservable? (Y/N), Discovery Sync ID, Department, Public IP, HP Care Pack Serial Number, Care Pack Part Number, Customer ID, Hardware Product ID, URL, Model Type, Grant Number, Memeo Serial, Dell - Service Tag, Product SKU, Entitlement No., Description, Support Level, Quantity, Purchase Date, Deployment Date, Replacement Date, Delete? (Y/N)]
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