Doesn't work with Memberpress Plugin

Hi! I installed your plugin yesterday. I’m using Memberpress Plugin too and yesterday everything worked right.

But today, your plugin doesn’t work and I don’t know what may be the cause.

I use this rule:

current_user_can(‘mepr-active’,’membership:254′)

Could you help me, please?
Thanks

https://ww.wp.xz.cn/plugins/menu-items-visibility-control/