Hi Harshit,
Your new role is probably not allowed to read from the Account entity. Make sure that the new role has read access to relevant attributes in the Account entity in your domain model.
I guess you are using the default Administration module.
The module has 2 roles Administrator and User.
If you are adding new roles to your project, you must ensure that you add one of these module roles to that new role as well.
Otherwise it will not work.