why cann't i use fcitx?

zovehua

my locale as follow:
LANG=zh_CN.gbk
LC_CTYPE="zh_CN.gbk"
LC_NUMERIC="zh_CN.gbk"
LC_TIME="zh_CN.gbk"
LC_COLLATE="zh_CN.gbk"
LC_MONETARY="zh_CN.gbk"
LC_MESSAGES="zh_CN.gbk"
LC_PAPER="zh_CN.gbk"
LC_NAME="zh_CN.gbk"
LC_ADDRESS="zh_CN.gbk"
LC_TELEPHONE="zh_CN.gbk"
LC_MEASUREMENT="zh_CN.gbk"
LC_IDENTIFICATION="zh_CN.gbk"
LC_ALL=zh_CN.gbk

my XMODIFIERS is
@im=fcitx

but when I "ctrl+space" ,it has no response
why?

北南南北

请说一下是哪个版本？
多谢。

zovehua

redhat8

fcitx-1.8.4