Click on Browse and find your file. Make sure you DO NOT tick the options Do not execute the "onSuccess" and "onValidate" Scripts. This is used to process your import.
Click Next
Make sure the Data Import mapping is located correctly
Select "Don't import the data" On Import Errors.
Click Import Data.
Compulsory: Name
and Code. Would be good to include: Description and Unit
Please find Attached a sample template for importing the Work Center