i've already put master builder and tribal chief to initiate the work..nothing happens... =( i couldnt updated my game to v.04...it said that the file is corrupted
You have the scaffolding in place, right? Work can't commence until you've found a place to anchor it.
As for the corrupted file, that means the file is damaged somehow; a likely cause for this is data that was misplaced during the download process. Try downloading the upgrade again, and running it one more time.