In network admin, go to Network Setup under tools and re-copy the specified content to the associated files, replacing what you placed there originally during the same step when you setup for subdomains. I believe there are subtle differences that could cause redirect problems.
Also in the main site’s settings, visit the permalinks settings screen and ensure the settings are as desired. Visiting this screen causes the rewrite rules to be flushed and regenerated, which also could be the source of too many redirects if not setup correctly.
Unfortunately it didn’t fix the error, I copied it, but it doesn’t work. It’s still wrong. I tried all versions of direct links, but nothing changed.
Switching network types is not a recommended practice. I tried it once going the other direction and found the process very difficult to achieve. Unfortunately, I cannot remember what I needed to do.
If the sub-sites are not well established yet, you may be better off reverting back to single site first, removing all multi-site related tables, then invoking a new subfolder network from single site. Make a complete backup first just to be safe. Make no mistake, this the “nuclear option”. You stand to lose sub-site content and network related user data. You could try to export the sub-site’s posts and taxonomy tables separately, then re-import after the new network is established, but there’s a risk of re-introducing the very things that are causing the trouble now.
Thnak you for the help. I think I will uninstall the Multisite. There is a lot of bad chance for crash and I’m not well prepared.
