For this tutorial in video form, click here
What does this error mean? You’d see this error if you’re a user without permission to run extensions. You’re probably going to need to ask your admin to help you out.
Your admin will need to go into the CRM under Setup > Users and Control > Security Control. Next, find the profile in question.
Make sure that “Manage Extensibility” is enabled.
If we try again, it’s a success!
Have your admin check out this tutorial and you’ll be good to go.