Foot height cannot be less than 200mm.
The Complete Message:
Continuous foundation ampathom height cannot be less than 200mm. (TS500 10.4.2)
Give the ampate height of the solid and so-called strip footing at least 20 cm.
Choose the strip footing, strip footings.
Enter the properties.
In the General Settings tab, enter at least 20 cm in the Upper H2 and Under H2 lines and click the OK button.