Security Roles restriction while trying to import unmanaged solution

Hi Experts,

              I am trying to import one of the solutions from the E-Learning resources - 80729- Customisation and Configuration. I am getting the following error;

'User cannot add privileges to or change access level for roles to which they are assigned. For help with changing a role, contact your Microsoft Dynamics 365 administrator'.

I googled it and came across one solution asking to change to security roles to Core record of Data performance dashboard to organisation level. I did that. Still it is not working.

Your help will be much appreciated.