003057: Invalid value in mapping table: '<value>'
Description
One or more field names contain an invalid character, such as a space or a leading number.
For the Create Locator tool, an invalid field name was entered for the field_mapping, alternate_field_mapping, or custom_output_fields parameter, for one of the following field names:
Locator role field name
Primary data field name
Locator role alternate field name
Alternate data table field name
For the Create Feature Locator tool, an invalid field name was entered for the search_fields, locator_fields, or custom_output_fields parameter, for one of the following field names:
Locator field name
Data field name
Additional locator field name
Additional data field name
Solution
Review the locator role and data field names in the script and use only alphanumeric and underscore characters, and avoid leading numbers, for the field names.