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: 
The file pubspec.lock is a generated file, so you can delete it and then regenerate it.

Delete **pubspec.lock**.

Run the following command:

```
flutter pub get

```

or

```
flutter pub upgrade

```

Notes on [pub upgrade](https://dart.dev/tools/pub/cmd/pub-upgrade) (you could probably skip the delete step).
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.