Coupling beam dimensions cannot be less than 300 mm.
The Complete Message:
Tie beam dimensions cannot be less than 300 mm. (TBDY 2018 16.8.5.4)
This message is given for the basic coupling beams.
In TBDY 2018 article 16.8.5.4 , the minimum size of coupling beams will be 300 mm × 300 mm, it is stipulated .
Solution
Give the dimensions of the so-called coupling beam at least 300 mm.
Select coupling beam, coupling beams
Enter the properties.
In the general tab, give the width and height at least 300 mm and click the OK button.