“Error deserializing the data due to a Rockstar Game Services error. Please try again later. Code: 6003” — this error (also known as — «Code 6003: Can’t open friendslist») occurs when you try to invite a friend to the GTA Online session. This error has appeared several days ago and is considered widespread. Many users complain about its existence on PC platform.
For now there is only one working solution that fixes this error code 6003:
- Open Command Prompt.
- In appeared Command Prompt screen type the following phrase: netsh winsock reset.
- Press ENTER.
- Restart your PC and try to launch GTA Online again.
Other solutions for error code: 6003 will be added in process of its appearance.