[aur-general] Can't upload package

Hi, Somebody has deleted *-ubuntu packages and i wanted to adopte and maintain them. But i have a minor problem. I can't upload 2 of 4 packages: fontconfig-ubuntu and libxft-ubuntu. It gives me that error: You are not allowed to overwrite the fontconfig-ubuntu package. You are not allowed to overwrite the libxft-ubuntu package. Can somebody fix that problem?