DESIGN NOT PERFORMED WITH PRISMATIC PROPERTIES USER-TABLE MAY BE USED TO DESIGN PRISMATIC SECTIONS

Hi,

I have created a section with section wizard by using plate elements in section builder as attached. i have exported to staad.pro with Prismatic option. Its not getting design with the Euro code and it showing the warning message as

*DESIGN NOT PERFORMED WITH PRISMATIC PROPERTIES, USER-TABLE MAY BE USED TO DESIGN PRISMATIC SECTIONS*. So when I try to export with General section it showing as *Profile points for this shape is will not be exported* (attached)

Neither Prismatic section is getting design nor we could export to General section. 

Help me in this.