SEO sitemap and checkup issues

SmartCrawl SEO sitemap for each subsite, and SEO Checkup scan for the main site isn’t working.

1) SEO Checkup for the main site isn’t working. The Scan isn’t going past 0-1%, don’t see any specific errors in the debug logs.

2) SmartCrawl Sitemaps are giving blank pages, when accessed. On giving a further, look disabling the “

Include Stylesheet With Sitemap” option in SmartCrawl, seems to resolve the issue in one of the subsites. However, could notice anomalies in other subsite sitemap though.

Another subsites sitemap is loading the following error:

No sitemap found. Maybe it's being generated. Please try again later.