Hi,

Please you have to check and change folder permission to 775 for the following folders:

cache, logs, tmp and administrator/cache

then go to: configuration.php

find code:

$log_path = 'xxxx';
$tmp_path = 'xxxx';

and change this code into:

$log_path = './logs';
$tmp_path = './tmp';

Best Regards 
AppClave Team