Problem moving my WordPress live site to localhost

Finally it was solved as follows:

  1. Enabled debug option in wp-config.php
  2. After several tests I found that a plugin (polylang) causes a conflict with Cherry Framework which I use with my template. I Removed the polylang plugin directory and managed to login WP admin. Since I use Cherry Framework I got an error message (File Not found) for wp-content/themes/mytheme/bootstrap/less/bootstrap.less and wp-content/themes/mytheme/style.less. So I removed the bootstrap.less.cache and style.less.cache from the corresponding folders.
  3. After I logged in the WP-admin reinstalled the plugin and everything came back to normal.