I want to calculate CUT and FILL volume between"Existing DEM raster" and "Planned DEM raster" using Arcpy CUT and Fill geoprocessing tool script in FME Pythoncaller Transformer (FME DESKTOP 2017.1.2.0).But I am getting below error

Python Exception <ExecuteError>: Failed to execute. Parameters are not valid.

ERROR 000865: Input before raster surface: elevation01 does not exist.

ERROR 000865: Input after raster surface: elevation02 does not exist.

Failed to execute (CutFill).

Error executing string `import fme

import fmeobjects

import arcpy

def processFeature(feature):

dataset = feature.getAttribute('_dataset')

arcpy.env.workspace = dataset

# Set local variables

inBeforeRaster = "elevation01"

inAfterRaster = "elevation02"

outRaster = "D:/CutFill"

zFactor = 0.5

# Check out the ArcGIS 3D Analyst extension license

arcpy.CheckOutExtension("3D")

# Execute CutFill

arcpy.CutFill_3d(inBeforeRaster, inAfterRaster, outRaster, zFactor)'

Factory proxy not initialized

f_76(PythonFactory): PythonFactory failed to process feature

A fatal error has occurred. Check the logfile above for details

Clipper_Raster(RasterClippingFactory): A fatal error has occurred. Check the logfile above for details.

Kindly guide to me to find the issue in above script .

Thanks

Venu