Uploading My Project To Heroku

Hi every one i'm Trying To upload My To Heroku but i get this error

    In PDOConnection.php line 47:
                                                       
        SQLSTATE[HY000] [2002] No such file or directory  
                                                       
   
       In PDOConnection.php line 43:
                                                       
     SQLSTATE[HY000] [2002] No such file or directory  
                                                       
   
     Script @php artisan package:discover handling the post-autoload-dump event returned    
    with error code 1
 !     Push rejected, failed to compile PHP app.
!     Push failed