If the save game data is stored in a Read-Only folder you may also see error messages. Check to ensure that the Rocket League folders is not Read-Only:
- Click on the yellow folder icon in the lower-left corner of the screen.
- Click on Documents.
- Click on My Games.
- Right-click the Rocket League folder.
- Choose Properties.
- Untick the Read-only box.
- Click Apply.
- Select Apply changes to this folder, subfolders, and files.
- Click OK.
- Click OK.
If you are trying to solve a Save Failure error in Rocket League and this did not help, try the next step: How do I reinstall Rocket League on a PC?