My second day of owning an OT and I get this???
It only happened once, should i be alarmed by this error?
Could it just be the Flash card?
I wouldnt be to freaked out…
I would try to remember what i did… and do it again…
if it did… I would post those findings to the nice people at HQ.
I just got this same thing (not sure if exception number is identical) while trying to reverse a sample. I had to shut the machine down and it appears my entire project was deleted 
Haven’t you saved it before?
When working on a project for a longer period of time I also recommend making project backups using PROJECT->SAVE TO NEW. Cards can fail or projects can become corrupted. So better be safe than sorry.
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I recommend that you make a support ticket on Elektron’s website.
Without all the details of the exception (photo) or a way to reproduce it this won’t help.
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UPDATE:
I connected my octatrack over USB to my computer and inspected the files, they appeared to still be in tact, and when I restarted the octatrack after that, the project was recovered.
maybe something about viewing the directory from another device de-corrupted it? I have no idea but glad it isn’t lost