There are some curious things in your post. First, there are no 12 inch MacBook Pro but there is a 12" MacBook. Your picture with the error had the name "Macbook Pro" below the image, but you refer to a MacBook. Which is it?
Second, the original error is kind of key to know as it points to whatever started the issue. Was it a kernel panic? Was it a report on a specific application (crash report)? Any clue would help.
Third, you said you called Apple and apparently did some sort of diagnostics with them. Was that the Apple hardware test? Is what is in this article what you did?
https://support.apple.com/en-us/HT202731
Fourth, did the reinstall of the operating system work at all? Did it ever boot? If the image you sent is correct, it looks like a booted screen in the background, but you referred to black screens only.
Frankly, I'm confused, still, by your descriptions.The problem sounds like either the logic board or SSD has failed, but in a way that the diagnostics they had you execute didn't find. But it is really hard to make sense of what you have told us so far. Please answer the questions and we'll see if we can get you going agin. Do you have a backup? I fear that any "fix" will involve reformatting the SSD, erasing it completely.