The problem happens when choosing exr. I've tried choosing exr only output 
and i attach the log.

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============================================
Assemblatura panorama...
============================================

Piattaforma: Linux 3.13.0-76-generic x86_64
Versione: 2016.0.0.5cc09f0259b5
Cartella di lavoro: /home/user/Scrivania/Canepanova/Prova-AMano
Prefisso dell'output: IMGP9985 - IMGP9996

Programma per l'unione: enblend 4.2-394716e93675
Versione ExifTool: 9.46

Numero di immagini attive: 6
Livello di esposizione dell'output: 6,2
Dimensione della superficie: 20144x20528
ROI: (7903, 5466) - (12343, 12255) 
FOV: 157x157
Proiezione: Rettilineare(0)
Utilizzo della GPU per la rimappatura falso

Formati di panorama:
* High dynamic range

Prima immagine in ingresso
Numero: 0
Nome file: /home/user/Scrivania/Canepanova/IMGP9985.tif
Dimensione: 4680x3116
Proiezione: Normale (rettilineo)
Tipo risposta: Personalizzato (EMoR)
HFOV: 98
Valore dell'esposizione: 6,2


Rimappatura delle immagini HDR...
Multiple images output
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
loading IMGP9985.tif
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
remapping IMGP9985.tif
Calculating mask
saving IMGP9985 - IMGP9996_hdr_0000.exr
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
loading IMGP9986.tif
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
remapping IMGP9986.tif
Calculating mask
saving IMGP9985 - IMGP9996_hdr_0001.exr
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
loading IMGP9987.tif
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
remapping IMGP9987.tif
Calculating mask
saving IMGP9985 - IMGP9996_hdr_0002.exr
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
loading IMGP9994.tif
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
remapping IMGP9994.tif
Calculating mask
saving IMGP9985 - IMGP9996_hdr_0003.exr
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
loading IMGP9995.tif
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
remapping IMGP9995.tif
Calculating mask
saving IMGP9985 - IMGP9996_hdr_0004.exr
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
loading IMGP9996.tif
Warning: no TIFFTAG_SAMPLEFORMAT or TIFFTAG_DATATYPE, guessing pixeltype 
'UINT16'.
remapping IMGP9996.tif
Calculating mask
saving IMGP9985 - IMGP9996_hdr_0005.exr

Fusione della pila HDR numero 0...
Fusione della pila HDR numero 1...
Unione pile HDR...
enblend: warning: no usable resolution found in first image "IMGP9985 - 
IMGP9996_stack_hdr_0000.exr";
enblend: note: Enblend will assume 300 dpi
enblend: info: loading next image: IMGP9985 - IMGP9996_stack_hdr_0000.exr 1/1
enblend: info: loading next image: IMGP9985 - IMGP9996_stack_hdr_0001.exr 1/1
enblend: info: writing final output
enblend: warning: must fall back to export image without alpha channel

enblend: an exception occured
enblend: 
Precondition violation!
exportImage(): file format does not support requested number of bands (color 
channels)
(/usr/include/vigra/impex.hxx:547)

enblend: info: remove invalid output image "IMGP9985 - IMGP9996_hdr.exr"
enblend: warning: could not remove invalid output image "IMGP9985 - 
IMGP9996_hdr.exr": No such file or directory

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