Importing local website to flywheel does not include pages, posts and users

I have reimported my site from “local sites” folder where i included the two sub-folders “app” and “logs” in one archive then i drag it to the Local. i have followed all the steps in the down-listed post:

after the importing being finished i’ve got the problem: " Your wp-config.php file has an empty database table prefix, which is not supported.". when i filled the prefix with “WP_” the browser guided me throw Wordress installation where asked for site name, password and email, after finishing, i have just seen my plugines, but posts, pages and users nothing of them exist.

please help i am in need of my site i’ve worked on it two moths and i need to finish it !

Any help please !?