Learning Forum

[arezoo.tahmasebi]

does anybody know how I can fix this error?

[Ethan Keeler]

Hi Arezoo,

Sorry about the trouble! Are you still receiving this error? Typically this error will show up if the file in your UNDO folder has become corrupted. You can check a few things:

1) Make sure that you have full read/write access to the Documents/Zemax/UNDO folder.

2) If you have any cloud services, like Microsoft OneDrive, make sure that the files are being stored locally and not on a network location.

3) Trying saving the file and restarting OpticStudio.

Please let us know if you continue to see this error.

Ethan