I regularly use a skyline analysis tool, but in recent 4-5 days I get error messages "ERROR 999999: Something unexpected caused the tool to fail. Contact Esri Technical Support (http://esriurl.com/support) to Report a Bug, and refer to the error help for potential solutions or workarounds".
Before that, I have successfully used the tool more effectively and smoothly. Now it is not stable. Any suggestions for this problem?
Did you start receiving the error after an upgrade (e.g. Upgrade to ArcGIS Pro 2.8.1)?
Looks like the data is stored on a network drive. Do you receive the error if the Output Feature Class is saved in a local drive (e.g. C:\ArcGIS\Projects\...)?
Are there other users accessing/editing the same geodatabase objects (Feature Class/ Feature Dataset, etc.)? FAQ: Can multiple users edit a file geodatabase at the same time?
Yes, it starts errors more often since the upgrade. Sometimes the tool seems to work but most of the time I get errors.
Anyway, no one can access or edit my data and I am the only user. I really have no idea why.
One question still remains. Do you receive the error if you save the data in a local drive (Do Not use UNC path)?
One more way to check is to downgrade your ArcGIS Pro (Uninstall current version/ Install older version from My Esri). But you should get this done under the supervision of Esri Technical Support.