I've a simple model to iterate through a feature dataset and rename all the feature classes, adding "geo." before the original filenames. The output of Rename tool looks like "geo.%Name%", but running the model i get Error 999999 message, i think it's because of the point after "geo", so i'd like to ask if there is a way to keep the point in the filename, but for the tool to ignore it and run the command?

  • You think that it is because of the point after "geo" but have you tested with and without to be certain? If so, then I suspect that you are violating a geodatabase naming convention and may need to stop doing so.
    – PolyGeo
    Sep 8, 2016 at 9:30

1 Answer 1


The error is caused by the point, that is an invalid character to use in a feature class name. More information about Defining feature class properties including naming conventions is discussed on this page.

If you want to separate geo from name then use an underscore.

  • You're right, looks like there's no way to put a point in the name of feature class, so i'll just use underscore instead of point, as you suggested. Thank you!
    – User6819
    Sep 8, 2016 at 10:24

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