Depending on your operating system, in your config.inc.php file you must indicate the path of the tar command, normally it is specified like this: tar = /bin/tar
You need to ask your administrator for the exact location of this command and make the necessary changes.
Note: Before the update, it did not appear in “google scholar”, I do not know when it disappeared.
I thought an update would solve the problem, but it still didn’t show up in “google scholar”.
These errors appear frequently in “error_log”.
[17-Mar-2022 10:06:16 UTC] PHP Warning: ini_set(): A session is active. You cannot change the session module's ini settings at this time in /public_html/lib/pkp/classes/session/SessionManager.inc.php on line 69
[17-Mar-2022 13:15:20 UTC] PHP Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 1267 Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=' in /public_html/lib/pkp/lib/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:78
[17-Mar-2022 08:52:35 UTC] PHP Warning: file_exists(): open_basedir restriction in effect. File(/bin/tar) is not within the allowed path(s): (/home:/home2:/home3:/usr/local/lib/php:/tmp:/usr/lib/php/:/usr/share/l.v.e-manager/:/opt/alt/php73/:/usr/local/lsws/) in /x/x/public_html/lib/pkp/classes/plugins/PluginHelper.inc.php on line 54
[17-Mar-2022 17:55:16 UTC] SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: This message was classified as SPAM and may not be delivered
[17-Mar-2022 18:41:48 UTC] PHP Deprecated: Non-static method Core::_getBaseUrlAndPath() should not be called statically in /public_html/lib/pkp/classes/core/Core.inc.php on line 231