Solution 1:
If "Runtime error 91: Object variable or With block variable not set" occurs after a DentalCAM 7 installation or Windows update, please see this related article:
Error while activating the 3D Viewer" Message Appears:
https://dentalsupport.vhf.de/en/support/solutions/articles/7000031667
Solution 2:
Products Effected: DentalCAM 7
Symptoms: Runtime error 91 occurs when the user initiates a job calculation
Solution: Runtime Error 91 could occur due to a DMT.pdt file being possibly corrupted. You can rename or delete the current DMT.pdt file and then
The file is located here: c:\vhf\DentalCAM_7\DMT.pdt)