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I was trying to clip dem by watersheds.

It was same process as below.



http://docs.qgis.org/2.2/ja/docs/training_manual/processing/iterative.html



But it doesn't work when it iterates.

Without iteration, I could clip my data.

I made sure that polygon(watersheds) and raster(dem) have same CRS.



I think this function is very useful for everyone.

Please give me some idea to fix this problem.



***error message from QGIS***

AttributeError: 'NoneType' object has no attribute 'error'

Traceback (most recent call last):

File "C:/PROGRA~1/QGIS21~1.1/apps/qgis/./python/plugins\\processing\\gui\\AlgorithmDialog.py", line 238, in accept

if runalgIterating(self.alg, self.iterateParam, self):

File "C:/PROGRA~1/QGIS21~1.1/apps/qgis/./python/plugins\\processing\\gui\\AlgorithmExecutor.py", line 90, in runalgIterating

if runalg(alg):

File "C:/PROGRA~1/QGIS21~1.1/apps/qgis/./python/plugins\\processing\\gui\\AlgorithmExecutor.py", line 52, in runalg

progress.error(e.msg)

AttributeError: 'NoneType' object has no attribute 'error'



Python version: 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)]

QGIS version: 2.16.1-Nødebo Nødebo, 8545b3b