Wordpress plugin error with RevSilder?

i have a wordpress website using Revolution Slider plugin, i got an error when i move this website to aws-ec2.

My Revolution Slider manage page show nothing, so i open debug mode and got below error message.

page is:wp-admin/admin.php?page=revslider

error msg:

Fatal error: Uncaught exception 'Exception' with message 'fetch - <b></b><br>---<br>
Query: select * from wp_revslider_css' in /var/www/html/wp-content/plugins/revslider/inc_php/framework/functions.class.php:7
Stack trace:
    #0 /var/www/html/wp-content/plugins/revslider/inc_php/framework/db.class.php(22): UniteFunctionsRev::throwError('fetch - <b></b>...', -1)
    #1 /var/www/html/wp-content/plugins/revslider/inc_php/framework/db.class.php(36): UniteDBRev->throwError('fetch - <b></b>...')
    #2 /var/www/html/wp-content/plugins/revslider/inc_php/framework/db.class.php(127): UniteDBRev->checkForErrors('fetch')
    #3 /var/www/html/wp-content/plugins/revslider/revslider_admin.php(241): UniteDBRev->fetch('wp_revslider_cs...')
    #4 [internal function]: RevSliderAdmin->onAddScripts('toplevel_page_r...')
    #5 /var/www/html/wp-includes/plugin.php(470): call_user_func_array(Array, Array)
    #6 /var/www/html/wp-admin/admin-header.php(80): do_action('admin_enqueue_s...', 'toplevel_page_r...')
    #7 /var/www/html/wp-admin/admin.php(202): require_once('/var in /var/www/html/wp-content/plugins/revslider/inc_php/framework/functions.class.php on line 7

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Can you please tell me how can i fix this error?

Thanks a lot.

via Chebli Mohamed