When validating an import, you may receive the following error if the import fields are not mapped correctly:
Validation error: please enter a valid 'amount'
For example, on the validation import control report, it may show that the Field is "Amount" but the "Field Value" shows dates. This means the application was expecting amounts but it received values of a different type.
Review the CSV import file to verify that all fields match the corresponding headings and make changes as necessary.