Question: I tried to run `flutter pub get` and I got this error:

```
Error on line 1, column 1 of pubspec.lock: Unexpected character
╷

1 │
│ ^

  ╵
pub upgrade failed (65;   ╵)

```

Answer: 
Delete the file at flutter/packages/flutter\_tools/pubspec.lock then try flutter pub upgrade again.

You may have interrupted the upgrade process before it finished hence the file became invalid.
I took the same error,
but this error was coming from my main folder.
in this path "C:\Users"yourusername"\AppData\Local\Pub\Cache\global\_packages\devtools"
I deleted the file and I started app. file has been by itself created and problem solved.