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Dear STKO Team：
i am trying to build a plane model ,it's about a three story and two bay steel frame; 图片2.png
but the beam section is not same along the entire beam,a damage link is insert into the beam end,and its section is somewhat like RBS,its section is reduced a lot,and there is a gap between ...

Dear STKO team：
Thanks!the problem has been perfectly solved

Dear STKO Team：
sorry,i have posted enlarged image and file,i just downloaded ex4 from official website,and i didn't change anything

Dear STKO Team:
sorry,i have not solved the problem, the error code is not actually same,i double checked the directory,and run a simple analysis in same folder,it could be done

Dear STKOteam:
i am a beginer of STKO,i download the ex4 from class 3 ,but when i select a directory to analysis,it encounters the problem like this,i checked my directory,it seems no illegal character in directory,i am confused.this is my directory:
C:\Users\Administrator\Desktop\steelframe\Week3 ...