Arcgis toolbox导入python script运行出错，实在找不出脚本哪里有问题。求助。

[lll1928]

import arcpy
arcpy.env.workspace = arcpy.GetParameterAsText(0)
inFeatures1 = arcpy.GetParameterAsText(1)
inFeatures2 = arcpy.GetParameterAsText(2)
outFeatureClass1 = arcpy.GetParameterAsText(4)  
outFeatureClass2 = arcpy.GetParameterAsText(5)
dissolveFields = arcpy.GetParameterAsText(3)
arcpy.Dissolve_management(inFeatures1, outFeatureClass1, dissolveFields)
arcpy.Dissolve_management(inFeatures2, outFeatureClass2, dissolveFields)
intersectOutput = arcpy.GetParameterAsText(6)
arcpy.Intersect_analysis ([outFeatureClass1,outFeatureClass2], intersectOutput, "ALL", "", "")
fieldPrecision = 18
fieldScale = 6
arcpy.AddField_management(intersectOutput, "New_Area", "FLOAT", fieldPrecision, fieldScale)
expression = "!SHAPE.area!"
arcpy.CalculateField_management(intersectOutput, "New_Area", expression, "PYTHON")

脚本如上，主要是用到arcpy里的dissolve和intersect功能，disslove是能正确执行的，但是intersect执行不了，得不到结果图层。
请问脚本里intersect处有什么问题吗？