Hi, for some reason, I keep getting the same errors in a very simple 1-storey project, it's the first time I've had it happen to me, you can see the errors in the attachment, I would be glad if you could help me. , -In the report picture you added; The cause and solution of the error message on the 1st and 2nd lines; -Ductility level was selected as limited in the TBDY wizard in the project Earthquake Design Class DTS=3 and DTS= If the Structural system type is selected as A33 in buildings other than 4, the condition Total Mdev>0.75Mo must be satisfied according to Equation 4.3 referred to in Article 4.3.4.7 The reason and solution of the error message on the 3rd line; -The carrier system type is selected A33 in the X direction, but there is no curtain in the X direction. A31 must be selected (If A31 cannot be selected in the TBDY wizard, it means that the regulation does not allow) The reason and solution of the error message on the 4th line;[/ b] One of the conditions specified in item 4.3.2.4.a) and b) in the Y direction is not met Analysis settings/TBDY Selected In the attachments tab, the line "Apply (4/5)R" must be checked. According to the picture you added, select the Ductility level "High", the Structural system type A11 in the X direction and A15 in the Y direction in the TBDY Wizard in your project. In this case, you will not receive the error messages in the first 3 lines. If you attach the project file, we will examine it in more detail.