hi
3.8.2 to 4.0.1 suite upgrade error

step 6 cms install/upgrade

Invalid SQL:
ALTER TABLE cms_article ADD previewvideo TEXT NULL DEFAULT NULL;
MySQL Error : Duplicate column name 'previewvideo'


klr1..jpg

delete previewvideo tablo but below the warning

Database error in vBulletin 4.0.1:
Invalid SQL:
insert into cms_widgettype(class, packageid)
values('CategoryNavBU', );
MySQL Error : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 2
Error Number : 1064


please help me upgrade forum