ur boundary condition is wrong and u did not define waveport correctly also ...
so first corrected these error then u will get right answer...........................
Added after 3 minutes:
according to me ur entirely structure is wrong u did not follow the correct path so first u deisgn strucuitrre step by step like firstly design ground plane then DRA and design feed.....is u provide me ur design data with frequency then i will try to make this .....................ok bbyeeeeeeeeeeeeee