Error 500 when accessing WHMCS Admin

[tidus666x]

Hello people

I have the following error when I try to access the admin panel

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: Syntax error or access violation: 1055 Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'admin_crm.tbladminlog.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by' in /var/www/vhosts/matricesolution.com/crm.wpany.net/vendor/illuminate/database/Connection.php:333 Stack trace: #0 /var/www/vhosts/matricesolution.com/crm.wpany.net/vendor/illuminate/database/Connection.php(333): PDO->prepare('select * from `...') #1 /var/www/vhosts/matricesolution.com/crm.wpany.net/vendor/illuminate/database/Connection.php(706): Illuminate\Database\Connection->Illuminate\Database\{closure}(Object(Illuminate\Database\MySqlConnection), 'select * from `...', Array) #2 /var/www/vhosts/matricesolution.com/crm.wpany.net/vendor/illuminate/database/Connection.php(669): Illuminate\Database\Connection->runQueryCallback('select * from `...', Array, Object(Closure)) # in /var/www/vhosts/matricesolution.com/crm.wpany.net/vendor/whmcs/whmcs-foundation/lib/Terminus.php on line 0

 

Here is some server information:

OS Ubuntu 16.04.2 LTS

Version Plesk Onyx v17.5.3_build1705170317.16 os_Ubuntu 16.04

PHP 5.6.30

max_execution_time : 3600

 

Thanks for your help