The error you're seeing:

X FileSystemException: Cannot resolve symbolic links, path = 'C:\Users\nnnnnnnnn\OneDrive??? ??????\flutter\sorc\flutter\bin\flutter'

(OS Error: The filename, directory name, or volume label syntax is incorrect., errno = 123)

🔍 What’s Causing It?

This issue is caused by invalid characters in your folder path — likely from your username or the folders inside OneDrive having non-ASCII characters or symbols that Windows and Flutter can’t parse correctly.

How to Fix It (Step-by-Step)

1. Avoid OneDrive or Special Characters in Path

Move your Flutter SDK folder somewhere simple and safe, like:

C:\flutter

Do NOT install it inside:

• C:\Users\<YourName>\OneDrive\...

• Any folder with space, unicode characters, or special symbols

2. Update Your Environment Variables

After moving your SDK:

1. Open Start → Edit the system environment variables

2. Click on Environment Variables

3. Under System variables, find Path → Click Edit

4. Add: C:\flutter\bin

   1. Click OK on all dialogs.

   3. Restart CMD / VS Code

   Close and reopen:

   • Command Prompt

   • VS Code

   4. Run Flutter Doctor Again

   In your command prompt, run: flutter doctor

   ⚠️ Note:

   • If your user folder contains non-English characters, consider creating a new Windows user with a simple name like devuser.

   • OneDrive often causes permission and path issues — better to avoid it for development tools.