![raster werks raster werks](http://heavenlyalbum.weebly.com/uploads/1/2/3/8/123802091/881920965.png)
Turning it off and back on again can work! If you want to just reboot the software and not your computer, make sure to kill all ArcGIS programs – you can open your task manager and find ArcROT, ArcGIS Connection Manager, and ArcGIS Cache Manager – make sure to kill each of those processes if they are running. Troubleshooting 101, but we all need a reminder sometimes.
![raster werks raster werks](https://i.ytimg.com/vi/bz5nTvSc9r8/hqdefault.jpg)
Look for any tool specific settings that could create problems – try simplifying your options until the tool runs, which will help you ID the problem.Check your environment settings for anything unusual.Check your projections/coordinate systems.Check the names of your inputs and outputs.Try the operation in a blank map document or in ArcCatalog.
![raster werks raster werks](https://i.ytimg.com/vi/8DzI9MwUtAk/hqdefault.jpg)
Here’s the summary of steps (followed by detailed explanations for each one), in an approximate order of how I try them – though circumstances will vary and you may have a hunch that one of these will work. In this article, I’ll lay out some places to look for the most common solutions to this problem. It is usually accompanied by misleading messages such as “ the table was not found” or something else. But one error message, with error code 999999, is painful to get because it means something went wrong, and even the software isn’t sure what it is. If you’ve worked with ArcGIS, you’ve certainly had your fair share of errors while running geoprocessing tools – many of them are quite descriptive and tell you exactly what’s wrong, while some are specific but cryptic.