Problem with "known incorrect sRGB profile"

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Stitching panorama...
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Platform: Windows 10 (build 10586), 64-bit edition
Version: 2016.0.0.3b4e2790cb90 built by Jan Dubiec <email address hidden>
Working directory: E:\! foto\upravene\2013-08-03 - Tatry - Priecne sedlo\panoramy
Output prefix: IMG_3945 - IMG_3950

Blender: enblend 4.2
ExifTool version: 10.14

Number of active images: 6
Output exposure value: -0,2
Canvas size: 1726x1205
ROI: (181, 30) - (1560, 660)
FOV: 179x125
Projection: Equirectangular(2)
Using GPU for remapping: false

Panorama Outputs:
* Exposure corrected, low dynamic range

First input image
Number: 0
Filename: E:\! foto\upravene\2013-08-03 - Tatry - Priecne sedlo\IMG_3945.jpg
Size: 683x1024
Projection: Normal (rectilinear)
Response type: custom (EMoR)
HFOV: 48
Exposure value: 0,0

Remapping LDR images...
Multiple images output
loading IMG_3945.jpg
remapping IMG_3945.jpg
saving IMG_3945 - IMG_39500000.tif
loading IMG_3946.jpg
remapping IMG_3946.jpg
saving IMG_3945 - IMG_39500001.tif
loading IMG_3947.jpg
remapping IMG_3947.jpg
saving IMG_3945 - IMG_39500002.tif
loading IMG_3948.jpg
remapping IMG_3948.jpg
saving IMG_3945 - IMG_39500003.tif
loading IMG_3949.jpg
remapping IMG_3949.jpg
saving IMG_3945 - IMG_39500004.tif
loading IMG_3950.jpg
remapping IMG_3950.jpg
saving IMG_3945 - IMG_39500005.tif

Blending images...
enblend: info: loading next image: IMG_3945 - IMG_39500000.tif 1/1
enblend: info: loading next image: IMG_3945 - IMG_39500001.tif 1/1
enblend: info: loading next image: IMG_3945 - IMG_39500002.tif 1/1
enblend: info: loading next image: IMG_3945 - IMG_39500003.tif 1/1
enblend: info: loading next image: IMG_3945 - IMG_39500004.tif 1/1
enblend: info: loading next image: IMG_3945 - IMG_39500005.tif 1/1
enblend: info: writing final output
enblend: warning: must fall back to export image without alpha channel

enblend: an exception occured
enblend:
Postcondition violation!
error in png_set_oFFs(): known incorrect sRGB profile
(C:\Prog\Hugin\static_vs2015_32\vigra-master\src\impex\png.cxx:592)

enblend: info: remove invalid output image "IMG_3945 - IMG_3950.png"