The following code is throwing exceptions. The exception occurs at different places in the code; where it breaks on one run it may have successfully gotten past on a previous run.Here's the error I'm receiving:ExecuteError: ERROR 000464: Cannot get exclusive schema lock. Either being edited or in use by another application.Failed to execute (AddField).This code runs without issue under 10.0.import arcpy import os, sys from xml.etree import cElementTree as ElementTree def addCoreFields(fc): arcpy.AddField_management(fc, "AssetObjectId", "LONG", "", "", "", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "AssetId", "LONG", "", "", "", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "AssetObjectStatus", "TEXT", "", "", "32", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "Status", "TEXT", "", "", "32", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "Feature", "TEXT", "", "", "32", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "SubFeature", "TEXT", "", "", "32", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "AssetCode", "TEXT", "", "", "32", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "LaneLocation", "TEXT", "", "", "32", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "Route", "TEXT", "", "", "32", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "FromMilepost", "LONG", "", "", "", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "FromOffset", "DOUBLE", "", "", "", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "ToMilepost", "LONG", "", "", "", "", "NULLABLE", "NON_REQUIRED", "") arcpy.AddField_management(fc, "ToOffset", "DOUBLE", "", "", "", "", "NULLABLE", "NON_REQUIRED", "") if __name__ == '__main__': scriptPath = sys.path[0] dataGDB = os.path.join(scriptPath, "data.gdb") if arcpy.Exists(dataGDB): arcpy.Delete_management(dataGDB) arcpy.CreateFileGDB_management(scriptPath, "data") sr = "PROJCS['NAD_1983_StatePlane_Arizona_Central_FIPS_0202_Feet_Intl',GEOGCS['GCS_North_American_1983',DATUM['D_North_American_1983',SPHEROID['GRS_1980',6378137.0,298.257222101]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]],PROJECTION['Transverse_Mercator'],PARAMETER['False_Easting',700000.0],PARAMETER['False_Northing',0.0],PARAMETER['Central_Meridian',-111.9166666666667],PARAMETER['Scale_Factor',0.9999],PARAMETER['Latitude_Of_Origin',31.0],UNIT['Foot',0.3048]];-17746700 -44067300 3048;-100000 10000;-100000 10000;3.28083989501312E-03;0.001;0.001;IsHighPrecision" for name in ['one', 'two', 'three']: fc = os.path.join(dataGDB, name) arcpy.CreateFeatureclass_management(dataGDB, name, "POINT", "", "DISABLED", "DISABLED", sr, "", "0", "0", "0") addCoreFields(fc)