Hello @fabio_offroadstore
There are multiple solutions you can follow one by one:
1.
You are missing swatch image place holder. Either upload it from the backend or upload manually to below file path
/home/public_html/vendor/Magento/module-catalog/view/base/web/images/product/placeholder
name should be swatch_image.jpg only.
2.
Check file/folder permission at vendor/magento/module-catalog/view/base/web/images/product/placeholder
3.
Remove pub/media/catalog/product/cache. (Removing this folder frees up space.)
Run bin/magento catalog:image:resize to generate a new image cache. (This step is necessary because, changed the path to cached images and must remove the previously cached images.) and then again run previous commands.
Manish Mittal
https://www.manishmittal.com/