Beam width cannot be less than 250mm.
The Complete Message:
Beam width cannot be less than 250mm. (TBDY 2018 7.4.1.1)
In TBDY 2018 Article 7.4.1.1 (a) , the beam body width will be at least 250 mm, it is stipulated. You are warned because the condition is not met.
Solution:
Give the width of the beam given the name and elevation of at least 250 mm.
Select the beam/beams
Enter the properties.
In the general tab, increase the beam width and click the OK button.