fcitx doesn't work! Help!

tgf

i use GNOME desktop. At beginning fcitx can work normally. But after i installed and removed some software packages, it doesn't work! it also can start, but i can't activate it by Ctrl+Space!! I try to reinstall it, but it still doesn't work!

Hope someone could help me!

my locale is

LANG=zh_CN.GB18030
LC_CTYPE=zh_CN
LC_NUMERIC="zh_CN.GB18030"
LC_TIME="zh_CN.GB18030"
LC_COLLATE="zh_CN.GB18030"
LC_MONETARY="zh_CN.GB18030"
LC_MESSAGES="zh_CN.GB18030"
LC_PAPER="zh_CN.GB18030"
LC_NAME="zh_CN.GB18030"
LC_ADDRESS="zh_CN.GB18030"
LC_TELEPHONE="zh_CN.GB18030"
LC_MEASUREMENT="zh_CN.GB18030"
LC_IDENTIFICATION="zh_CN.GB18030"
LC_ALL=