Can't attach curved wall to curved floor mass

[cohinchi10]

can i ask how to attach a curve wall to a curved floor mass?  i want to attach the wall to highlighted blue part if its possible.

[barthbradley]

curved floor MASS?  What does that mean exactly?  Need more information in order to advise you.  Post your file here as an Attachment to a Reply Post. That'll make it an easily troubleshoot and faster than blindly throwing out suggestions. 

[cohinchi10]

oh sorry um i created the mass as a floor because it won't create as a roof so i opted it to be created as a floor but then i don't know how to attach the wall to it. here's the file  thank you. 

[ToanDN]

Create a roof by face from the mass and attach the wall to it.

[cohinchi10]

the mass won't create as a roof it only can be created as a wall.