I made further research and I found that probably there was a missing code “index.php” in the URL. The error didn’t occur when I found the posts by tags.
For example:
The error with the URL is “http://localhost/demo/category/tphcm+viet-nam/”.
The right URL for the results is “http://localhost/demo/index.php/category/tphcm+viet-nam/”.
How can I add that?
