The error means that this user requires a permission but does not have it.
What is unhelpful is that that error gives no indication of what permission is required.
1)You can demonstrate that it is role related by temporarily granting the system admin role to the user account.
The user should then be able to view anything. However, granting the system-admin role is undesirable (unless by change the user is a system administrator), so once you have convinced yourself that it is indeed role related be sure to remove the system admin role from the user account.
2)Track down which permissions are missing. Once you have identified the missing permissions you can add them.
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