I have a URL on my site that is working perfectly. I have the robots with the index and follow, but when I Fetch as Google in the WMT says Unreachable and gives me this message in the crawl errors report:
Last crawled: 6/30/18 First detected: 2/6/18 Googlebot couldn't access the contents of this URL because the server had an internal error when trying to process the request. These errors tend to be with the server itself, not with the request. More info.
What is the problem?