I need help with the Role Manager plugin

I am pleased with this plugin as I can have certain pages of my site with limited access.

I have one problem though. If a limited user tries to access a ‘private’ page of my site, there is no error message — just gets to some weird page.

Is there a way I can give him a custom error message?

site: https://choveveitzion.com/

private page: https://choveveitzion.com/trissim-repairs/trissim-ripped-strap-new/

Thank you!