An invalid encoding was specified for the data product data source

Your product data source contains an invalid character for the current encoding setting. To change a file's encoding settings in your Google Merchant Center:

In your Merchant Center account, click Settings in the left navigation menu.

Select Data sources.

Under the “Product sources” tab, select a product source.

On the page that loads, select the Your setup tab and click the pencil icon across the “Encoding” option.

Select the correct encoding option.

Click Save.