When try click select user for pop up got Error

please Help, when i click to sellect account, then show popup and got error like that

Access forbidden!

You don’t have permission to access the requested object. It is either read-protected or not readable by the server.
If you think this is a server error, please contact the webmaster.

Error 403

Make sure your roles and groups are configured properly. Check this link for some ideas:
https://www.sugaroutfitters.com/docs/securitysuite/example-of-a-typical-setup