File Corrupted After Opening Offline

[john.heredia]

My file will not open, it's reported as corrupted by Fusion360. The 3 latest versions were all corrupted (40, 41, 42) Although many t-spline bodies are contained within the document, no t-splines were created after version 39.

The model was last successfully saved 9 pm 1/25/21. It was not opened further until 7 pm 1/26/21, when I attempted to open it while offline. Fusion returned a corrupted file notice. I unsuccessfully attempted to open the file online and offline, after restarting my computer and fusion. Although it may not be related to me opening the file offline, I felt I should mention how I opened it anyway. This was the first time I opened the file online. 

This is the error message. The same message occurs when opening v42, v41, and v40.

Attached below are the diagnostic logs.

[john.heredia]

Here's a link to the design v42: https://a360.co/2YqeNIN

[john.heredia]

Can someone help me out? I lost hours of progress on my project and I'd like to know if I can recover any of it.

Looking through the error reports I can see a couple interesting things:

On 01/25/2021, I had the file (as well as fusion 360) open for several hours. During this time, I created each of the versions which were corrupted, as well as version 39, which is not corrupted. I closed fusion at 21:56. In the log "AppLogFile20210124T222740," Fusion shuts down at the very end of the document. However, after line 3026, an error message is shown:

20210125T215622 E NEUTRON_BUG_ALERT(m_entitiesById.find(pEntity->id()) != m_entitiesById.end()) 
Function: Ns::SegmentImpl::_remove
File: R:\Core\Neutron\Server\DataModel\Segment\Impl\implSegment.cpp
Line: 937
Thread Info: [Name: Main], [Id: 16136]

After that error, the log ends. The error seems to be the most significant element of this log out of place compared to other logs.

I believe the function NS is related to spline calculation. I downloaded a fusion360 archive of my design and directly edited the t-splines within the file. I inserted each t-spline individually into a separate project, and every t-spline seemed to work correctly. However, some of the most recent t-splines were not present, even though there was evidence that certain working t-splines contained edits that I made during the latest, now corrupt version. I also tried deleting all t-splines and loading the design, however fusion still indicated the document was corrupt and did not open it.

Whenever I try to open a corrupt version of the file, the error and path in the logs are always the same:

20210126T191156 I Begin:	Opening the document: EGDF Helmet v42 at path: C:/Users/johnh/AppData/Local/Autodesk/Autodesk Fusion 360/WXUML66NRP3T/W.login/F/_EGDF Helmet.b25d6ced-1613-4adc-8e9d-e030bbaa7b29.f3d
20210126T191156 I Workflow start: WIPRequest7 1-6010bddc-3359cf2ae50c4210adb44ff4
20210126T191157 I Request(https://developer.api.autodesk.com/wipdata-serv/storage/v3/lineages/urn%3Aadsk.wipprod%3Adm.lineage%3AeVIiEEetSMa3bgrJvfbtSg/versions?limit=10&sort=DESC) - workflow:WIPRequest7 attempt:0 status:200 requestId:f360_WIPRequest7__1-6010bddc-3359cf2ae50c4210adb44ff4
20210126T191157 I Workflow start: WIPRequest4 1-6010bddd-eddf24f2208f44be8f965904
20210126T191157 I Request(https://developer.api.autodesk.com/wipdata-serv/storage/v3/lineages/urn%3Aadsk.wipprod%3Adm.lineage%3AeVIiEEetSMa3bgrJvfbtSg) - workflow:WIPRequest4 attempt:0 status:200 requestId:f360_WIPRequest4__1-6010bddd-eddf24f2208f44be8f965904
20210126T191157 E NEUTRON_BUG_ALERT(status.isOk())

Function: Ns::AssetImpl::fullyInitializeIfNeeded
File: R:\Core\Neutron\Server\DataModel\Asset\Impl\implAsset.cpp
Line: 437
Thread Info: [Name: Main], [Id: 12072]
20210126T191157 I Time Taken:	1.2380998999999999
20210126T191157 I End:	Opening the document: EGDF Helmet v42 at path: C:/Users/johnh/AppData/Local/Autodesk/Autodesk Fusion 360/WXUML66NRP3T/W.login/F/_EGDF Helmet.b25d6ced-1613-4adc-8e9d-e030bbaa7b29.f3d

I don't know whether these error messages can reveal much about what is affecting my design, but I hope they can help.