Error In Menus - URGENT

[imarketing]

All the menus does not work every time I click in any of them like about us, services, faq, contact ... I get the error "404 Page Not Found"
I search on internet and the people said that maybe is an error with the "Friendly URLS" but I do not know how to fix it.

[ossmygoal]

Dear friend,

Please tell us it worked well before or this is the first time you have installed jv-planify theme and get this error?
Please try to re-save permalinks by navigate to:
- Setting > Permalinks > just click on Save changes

If still have issue, please send us your site admin info via joomlavi.dev (at) gmail, with your Themeforest code.
Thank you.

Best regards.