This issue is solved:
Error Location: main.php and function.php of /public_html/sitename/oc-content/themes/osclasswizards
I used coffeecup html editor to edit PHP files.
When i edited this before a week, without our knowledge [?] a question mark auto inserted in the beginning of the file. so the meta tag section pulled to BODY element.
the MAIN.PHP locked the metatags in main page and the FUNCTION.PHP locked the metatags in all other pages including posts and listings.
Now after removal of that ? mark this issue is solved.
Thanks to all
Example of the error: You shall find the ? mark before the PHP Open tag. This is a common issue with COFFECUP HTML/PHP EDITOR
?<?php
/*
* Osclass – software for creating and publishing online classified
* advertising platforms
*
* Copyright (C) 2014 OSCLASS
*
* This program is free software: you can redistribute it and/or
* modify it under the terms of the GNU Affero General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
DEFINES
*/