CSV Import to Add new Customers > Error: Illegal ID. Please enter a name

This problem occurs when the following conditions are met:
1. Setup > Company > General Preferences >  DEFAULT CUSTOMER TYPE = Individual
2. Type field is not exposed on the form selected during the CSV Import  (In Step 2 : Import Options > Advanced Options >  CUSTOM FORM).

To resolve the problem:

1. Navigate to Customization > Forms > Entry Forms.
2. Edit the custom form selected on Import Advanced Options.
3. Click Fields tab > Main > enable the Show check box for Type field.
4. Click Save.