Error: You don't have permission to access / on this server

I have MAMP installed on both my iMac and MacBook for developing websites. Everything works fine on my MacBook, but I get the following when I try to go to test.example.com:

Forbidden

You don’t have permission to access / on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. Here is what I have at the bottom of my https.conf file, with my real domain changed for example.com. Again, this same snip works fine on my MacBook:

NameVirtualHost *

<VirtualHost *>
ServerName test.example.com
DocumentRoot /Users/robert/Documents/Websites/Example.com/Test/

Here is a snip from my hosts file:

127.0.0.1 test.example.com

In the MAMP settings, on both computers, it points to the right directory, which is:

/Users/robert/Documents/Websites/

I made sure that my permissions for the Documents folder on my computers is 644. Please help me figure out why everything works fine on my MacBook but not my iMac.

Thank you!

Hello? Is there anyone who can help?

Thanks!