openwrt出现The called action terminated with an exception无法登录路由器

手贱安装了一个主题，然后登录时就出现这种情况了

usr/lib/lua/luci/dispatcher.lua:448: Failed to execute function dispatcher target for entry ‘/’.
The called action terminated with an exception:
/usr/lib/lua/luci/sauth.lua:87: Session data invalid!
stack traceback:
[C]: in function ‘assert’
/usr/lib/lua/luci/dispatcher.lua:448: in function ‘dispatch’
/usr/lib/lua/luci/dispatcher.lua:195: in function </usr/lib/lua/luci/dispatcher.lua:194>

解决方法：

删除/tmp/luci-sessions目录下的所有文件