a six-band antenna simulation help with CST

I simulate a six-band antenna with cst.but there is some error.
I think the problem is in the feed. Could anyone help me with it ?
I upload the antenna CST mod and this antenna paper.
thanks a lot!

the paper is in the web
https://www.edaboard.com/viewtopic.php?p=631940#631940

could anyone help me ? thanks a lot