I had this same error so I wrote to ESRI Poland help-desk. Here is an answer: Create new Toolbox in ArcCatalog Add it to ArcToolbox Copy Multiple Ring Buffer to your new Toolbox Right click -> Properties -> Validation -> Edit Open script Find: locale.setlocale(locale.LC_NUMERIC, '') Correct it to: locale.setlocale(locale.LC_NUMERIC, 'C') In my situation it works correctly now. I have ArcGIS 10 SP2 and Windows 7 OS. Works perfect for me too! Thanks for the solution!!!
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