This specific error message means that your BBGM user does not have adequate permissions to use this feature. For example, if your user has "View-Only" permissions for Blackbaud Grantmaking, then you won't be able to do much with this plugin (because that license level does not allow you to create activities or add documents).

Note: Only your organization's administrator can move your user into a different permissions group, so to resolve this issue, contact whoever manages BBGM at your organization and ask them to reach out to support to get your user account added to a different permissions group. Admins - When you contact to support, be sure to specific which permissions group that you'd like this user to be added to.