FATAL ERROR: Cannot write to undo file (probably disk full)

[Anonymous]

Hello,

I use DWG Trueview 2020. But most of the times when I measure (distance) I got fatal error. 

Someone who knows what the problem is? 

[pendean]

Thing to try:
https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/Fatal-...
and