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Forgive, use automatic translator, i'm italian user.

At the suggestion of the users list Italian of Qgis, and i write about this probable bug.

I point out, with the use of geoprocessing, the shapefile containing the z dimension, with the layer of the temporary, the output returns error 10005.

If, for example, use the geoprocessing to find the symmetric difference between two shapefiles (menu vector --> Geoprocessing tool, if I leave it default, it gives me error 1005, instead if i save a file, it works regularly.

This is the log:

2017-11-28T10:16:35 2 Uncaught error while executing algorithm
Traceback (most recent call last):
File "/usr/share/qgis/python/plugins/processing/core/GeoAlgorithm.py", line 203, in execute
self.processAlgorithm(progress)
File "/usr/share/qgis/python/plugins/processing/algs/qgis/SymmetricalDifference.py", line 71, in processAlgorithm
fields, geomType, layerA.crs())
File "/usr/share/qgis/python/plugins/processing/core/outputs.py", line 326, in getVectorWriter
crs, options)
File "/usr/share/qgis/python/plugins/processing/tools/vector.py", line 600, in init
uri = GEOM_TYPE_MAP[geometryType] + "?uuid=" + unicode(uuid.uuid4())
KeyError: 1005

These are the information of my Qgis:

Versione di QGIS
2.18.14
Compilato con Qt
4.8.7
Compilato con GDAL/OGR
2.2.2
Compilato con GEOS
3.5.1-CAPI-1.9.1
Versione client PostgreSQL
10.0
Versione QWT
5.2.3
Versione QScintilla2
2.9.3
Revisione codice QGIS
ff83b9a
Esecuzione con Qt
4.8.7
Esecuzione con GDAL/OGR
2.2.2
Esecuzione con GEOS
3.5.1-CAPI-1.9.1 r4246
Versione SpatiaLite
4.3.0a
Versione PROJ.4
493

I enclose also the shapefiles used have the same name, so I added new and old, to differentiate.