Need help debugging this addon

[lil7rocket]

I rewrote the welcome thread template to use Vboptions and now i cant seem to get past this particular bug

Fatal error:

* That username is already in use. If you are Rocket and you have forgotten your password, click here.

Unable to proceed with save while $errors array is not empty in class vb_datamanager_thread_firstpost in /includes/class_dm.php on line 763
this part of the bug is not a problem the first part is the error

when I try registering a new name while calling another name from options

[lil7rocket]

fixed that now I get only this
Fatal error: Direct Instantiation of vB_DataManager_ThreadPost class prohibited. in /includes/class_dm_threadpost.php on line 47

anyone know one of its subclasses that will hold both pagetext and postuserid as valid fields or if i can instantiate 2 classes ?