Ayman

couldn’t find on the admin panel

Go to the “Settings”-“User Role Editor” menu item and change your WordPress standard roles capabilities according to your needs.

I want to create a new role form editor role. So, i just want to copy existing role and its capabilities and wanna make it as automated script.

You can even try to use Advanced Access Manager

as this plugin gives you the possibility to create new user roles.

Hope this helps.

It sounds like plugin conflict probleam or other plugin that has the control over the user roles.

Try installing it on a fresh WordPress Installation without any other plugins.
if it goes well than start adding the other plugins one by one.

Ps. If you wanna install any plugin that takes over the user role control always do that last. meaning that you should install all other plugins first and than the role controller.

It may be a database connection problem / slow server load … Anyway you can try uninstalling and installing back the plugin and see of that solves the problem.