I read somewhere I had to add
127.0.0.0 blackwell.com
line to /etc/hosts file, and I tried doing that as well, but it still gives the same error.
add something like this
192.168.1.123 blackwell.com
to your /etc/hosts file…where the IP address matches the one your system is assigned
The 127.0.0.x range will only work on the local machine and if that is within a VM, there might be a firewall or IP address restriction that prevents access to keep it secure