Hi Johnson,
My customer has the same error. This error happened maybe 5-10x in the Inventor 2020 (now 2020.2). Recovering a file from the OldVersions folder has helped us to solve the problem, but it happened several times and it is very annoying (for .idw files only).
I looked at similar forums (https://forums.autodesk.com/t5/inventor-forum/error-loading-segment/td-p/8875743) and I found the necessary answers:
1) Are you able to reproduce it? NO
2) What was the last operation you did? EXPORT TO .pdf FILE AND SAVE .idw
3) How do you store the file? On local drive? On shared network drive? Or cloud drive? Do you use an EDM system like Vault? HE USING SHARED NETWORK DRIVE
4) Do you have encryption tool running? NOT SURE - PROBABLY NOT
5) Does anybody else have access to the file? YES - MAYBE 30 PEOPLES.
I can also send you the broken file to email.
Thank you.
Milan