fixing a boot error on a fusion drive

[patatapon]

Hi!

My Mac crashed today...
I'm not familiar with repairing my computer, this computer use fusion drive.

When rebooting, I just get the grey screen, and after a long while get the Apple logo that changes into a kind of "prohibited sign".

So, I did a few things I read about on the net =

I booted doing a shift+cmd+v to see what happen during the boot.
When I do that =texts scroll and end up with a "still waiting for root device" or something.

I rebooted again with a cmd+R to repair.
When doing that I can access the repair menu.
I started Disk Utility which detects a error on the disk.

Disk Utility says "disk error = a error has occurred on your disk. Would you like to revert it to a working state."
"this will erase the following volumes:" and then nothing is listed in the box below.

I can click on "fix" or "ignore".

Now my question is= should I press the "fix" button ? how should I interpret that nothing is listed on the box that lists what would be erased:

-nothing will be erased ?
-everything will be erased ?
-there a bug ?

My major concern now is that I'll lose 2 weeks of work if I can't solve that properly.


thanks for your help!