I don't know what tool you're using to do the crawling, because Solr itself does not crawl. It just indexes text. So you must have some other tool that is fetching data and feeding it to Solr.
> WARNING: Solr returned an error #404 Not Found > WARNING: IOException while reading response: java.io.FileNotFoundException: > https://localhost:8986/solr/childrens/update/extract?literal.id=https%3A%2F%2Fdev103-choa.choa.org%2Ftestpodcasts%2Fam-test-11-10-22&literal.url=https%3A%2F%2Fdev103-choa.choa.org%2Ftestpodcasts%2Fam-test-11-10-22 > ERROR: THREAD 4: https://dev103-choa.choa.org/testpodcasts/am-test-11-10-22 > FAILED "404 Not Found" is an HTTP status code that says "I tried to fetch content from a URL, but there is no content at the URL." Beyond that, we can't say. Maybe the crawling tool fetched a page, but that page has a link to a non-existent URL. Andy