030404: The input travel mode file is empty. The network dataset's existing travel modes will be deleted, and none will be added.

Description

This warning occurs when replacing the network dataset's travel modes using the travel modes defined in a .json file, and the .json file contains an empty JSON object. The network dataset's existing travel modes will be removed, and no new travel modes will be added.

Solution

If your intention is to delete all travel modes from the network dataset, ignore the warning because the tool is working correctly. If you want to add travel modes to the network, either use a different .json file with valid travel mode definitions or add travel modes to the network manually using the network dataset property pages.