i have error code 205 on dreamweaver

The Adobe Creative Cloud 2019 and later apps store user and license information in the Windows Credential Manager and macOS Keychain. Sometimes Adobe apps are unable to store your profile and licensing information in secure storage and when you try to open an Adobe app, you might get the error code 205.

SOLUTION #1:

1. Open CC Desktop App.
2. Click your Avatar (top right image) > Preferences > General tab > Settings. Select "Always keep Creative Cloud up to date."
3. Click on your Avatar again.
4. Sign-out of Creative Cloud.
5. Close all apps.
6. Restart your computer.
7. Open CC Desktop app.
8. Click your Avatar.
9. Sign-in with your paid ID and password.

See this help article for more solutions:

https://helpx.adobe.com/download-install/kb/fix-licensing-error-205.html