Error establishing a database connection

I got this error message trying to install a demo wp theme. Any solution please?

wp_posts: Table ‘elitecreate.wp_posts’ doesn’t exist
wp_comments: Table ‘elitecreate.wp_comments’ doesn’t exist
wp_links: Table ‘elitecreate.wp_links’ doesn’t exist
wp_options: Table ‘elitecreate.wp_options’ doesn’t exist
wp_postmeta: Table ‘elitecreate.wp_postmeta’ doesn’t exist
wp_terms: Table ‘elitecreate.wp_terms’ doesn’t exist
wp_term_taxonomy: Table ‘elitecreate.wp_term_taxonomy’ doesn’t exist
wp_term_relationships: Table ‘elitecreate.wp_term_relationships’ doesn’t exist
wp_termmeta: Table ‘elitecreate.wp_termmeta’ doesn’t exist
wp_commentmeta: Table ‘elitecreate.wp_commentmeta’ doesn’t exist