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Even if the special condition given in 7.6.1.3 is fulfilled, you receive this message because the wall thickness is less than 200 mm.
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Solution:
Give the size of the curtain shearwall with the name and floor at least 200 mm.
Choose curtainsshearwall, curtainsshearwalls.
Enter the properties.
In the general settings tab, increase the curtain shearwall width and click the OK button.
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ΣAg = The sum of the cross-sectional areas of the structural system elements working as a curtain shearwall parallel to the earthquake direction considered at any floorstory.
ΣAp = Sum of plan areas of all floors stories of the building
Vt = Total earthquake load (base shear force) acting on the building according to TBDY 2018 Section 4
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