DB error - can't insert data in DB - Flexslider blocks

Hi
I wish to create a new option set, after customizing the options and press "save", the site responds what's in italic below. Looks like the table for the option set does not exist on the drupal DB, as I confirmed by entering through phpmyadmin. So imposible to define custom option sets. Does anyone knows how to work this out? Is it an installation error that did not create the table or what could it be?
Thanks in advance. Here is the response of the site

PDOException: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'drupal.flexslider_optionset' doesn't exist: INSERT INTO {flexslider_optionset} (name, title, theme, imagestyle_normal, imagestyle_thumbnail, options) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5); Array ( [:db_insert_placeholder_0] => flex_caroussel_gallery [:db_insert_placeholder_1] => Caroussel gallery [:db_insert_placeholder_2] => classic [:db_insert_placeholder_3] => flexslider_full [:db_insert_placeholder_4] => flexslider_thumbnail [:db_insert_placeholder_5] => a:38:{s:9:"namespace";s:5:"flex-";s:8:"selector";s:12:".slides > li";s:6:"easing";s:5:"swing";s:9:"direction";s:10:"horizontal";s:7:"reverse";i:0;s:12:"smoothHeight";i:0;s:7:"startAt";s:1:"0";s:14:"animationSpeed";s:3:"600";s:9:"initDelay";s:1:"0";s:6:"useCSS";i:1;s:5:"touch";i:1;s:5:"video";i:0;s:8:"keyboard";i:1;s:16:"multipleKeyboard";i:0;s:10:"mousewheel";i:0;s:17:"controlsContainer";s:27:".flex-control-nav-container";s:4:"sync";s:0:"";s:8:"asNavFor";s:0:"";s:9:"itemWidth";s:1:"0";s:10:"itemMargin";s:1:"0";s:8:"minItems";s:1:"0";s:8:"maxItems";s:1:"0";s:4:"move";s:1:"0";s:9:"animation";s:4:"fade";s:9:"slideshow";i:1;s:14:"slideshowSpeed";s:4:"7000";s:12:"directionNav";i:1;s:10:"controlNav";s:1:"1";s:8:"prevText";s:8:"Previous";s:8:"nextText";s:4:"Next";s:9:"pausePlay";i:0;s:9:"pauseText";s:5:"Pause";s:8:"playText";s:4:"Play";s:9:"randomize";i:0;s:13:"animationLoop";i:1;s:13:"pauseOnAction";i:1;s:12:"pauseOnHover";i:0;s:14:"manualControls";s:0:"";} ) in drupal_write_record() (line 7136 of /X11/home/docetribus.com.ar/public_html/includes/common.inc).
Error
The website encountered an unexpected error. Please try again later.