You can come across with this error while upgrading your macbook/macmini from Yosemite 10.10.4 to El Capitan 10.11.
To fix that, please follow the below mentioned steps.
- From above menu, click on Tools > Disk Utility.
- Select your Hard drive in which you are installing EL Capitan 10.11.
- Click on File > Enable Journaling.
- Try to upgrade now. It should work.
