The Complete Message:
Single foundation thickness cannot be less than 1/4 of the cantilever opening. (TS500 10.3.2)
Solution:
It can be increased the thickness of solid and so called singular foundations.
Column can be enlarged to reduce cantilever opening
The individual foundation size can be reduced.
Select singular foundation, singular foundations
Enter the properties.
In the general settings tab, enter the appropriate size in the Size X and Size Y lines.
You can change the thickness in the same place.