macOS Sierra Installation issue!

In this case, you are going to need to try erasing the drive before reinstalling Mac OS.

Install El Capitan or Later from Scratch

If possible back up your files.

1. Restart the computer. Immediately after the chime hold down the CommandandRkeys until the Apple logo appears. When the Utility Menu appears:
2. Select Disk Utility from the Utility Menu and click on the Continue button.
3. When Disk Utility loads select the volume (indented entry, usually Macintosh HD) from the Device list.
4. Click on the Erase icon in Disk Utility's main window. A panel will drop down.
5. Set the Format type to APFS (SSDs only) or Mac OS Extended (Journaled.)
6. Click on the Apply button, then wait for the Done button to activate and click on it.
7. Quit Disk Utility and return to the Utility Menu.
8. Select Install OS X and click on the Continue button.

This will install the version of OS X you had installed.

If this fails then it means your hard drive or SSD will need to be replaced.

Reinstall El Capitan or Later Without Erasing Drive

Please be sure you back up.

1. Restart the computer. Immediately after the chime hold down the Command and R keys until the Utility Menu appears.
2. Select Disk Utility and click on the Continue button.
3. Select the indented (usually, Macintosh HD) volume entry from the side list.
4. Click on the First Aid icon in the toolbar. Wait until the Done button activates, then click on it.
5. Quit Disk Utility and return to the Utility Menu.
6. Select Reinstall OS X and click on the Continue button.

Also, see this User Tip: Basic Steps for Upgrading OS X.

You might look at this site for a new hard drive. They have installation videos so you can do it yourself. I have purchased RAM several times, a MacBook Pro battery, and 2 hard drives from Other World Computing and have always been very satisfied with the product and service.

Other World Computing

But you got the error after erasing the drive? Is that correct? If so, then you need to replace the HDD. Does your computer have an HDD or an SSD? If it is the latter, then you need to take it to Apple for repair.

Did you do this before you tried First Aid or after? Were you able to erase the drive? If so, then what happened?