I had this issue when I changed the `etc/hosts` file to let my backend point to a domain name instead of localhost.
It was like this when I had this issue.
```sh sudo nano /etc/hosts ```
```conf 127.0.0.1 site.local 255.255.255.255 broadcasthost ::1 localhost ```
I just changed my 127.0.0.1 address to localhost like this:
```conf 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost ```
Then running `flutter run -d chrome` will be okay now.

I had this issue when I changed the `etc/hosts` file to let my backend point to a domain name instead of localhost.
It was like this when I had this issue.
```sh sudo nano /etc/hosts ```
```conf 127.0.0.1 site.local 255.255.255.255 broadcasthost ::1 localhost ```
I just changed my 127.0.0.1 address to localhost like this:
```conf 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost ```
Then running `flutter run -d chrome` will be okay now.