Arch Linux

Description:
I notice that okular 20.08.1-1 has a problem with the menu "file -> print preview",
when I try to click to "file -> print preview" menu then a blank page is displayed instead of the print preview.

I can see these error messages in the console when running okular, after clicking on the print preview menu :

$ okular
ATTENTION: default value of option vblank_mode overridden by environment.
Settings::instance called after the first use - ignoring
**** Unable to open the initial device, quitting.
(libspectre) ghostscript reports: fatal internal error -100org.kde.okular.generators.spectre: Generated image does not match wanted size: [0x0] vs requested [574x812]
QImage::scaled: Image is a null image
**** Unable to open the initial device, quitting.
(libspectre) ghostscript reports: fatal internal error -100org.kde.okular.generators.spectre: Generated image does not match wanted size: [0x0] vs requested [557x788]
QImage::scaled: Image is a null image
**** Unable to open the initial device, quitting.
(libspectre) ghostscript reports: fatal internal error -100org.kde.okular.generators.spectre: Generated image does not match wanted size: [0x0] vs requested [80x113]
QImage::scaled: Image is a null image
**** Unable to open the initial device, quitting.
(libspectre) ghostscript reports: fatal internal error -100org.kde.okular.generators.spectre: Generated image does not match wanted size: [0x0] vs requested [557x788]
QImage::scaled: Image is a null image


Additional info:
* package version(s) okular 20.08.1-1
* config and/or log files etc.
* link to upstream bug report, if any :
https://bugs.kde.org/show_bug.cgi?id=426935

Steps to reproduce:
1. Install okular 1.11.1
2. Open a PDF document
3. Then click on the menu "file, print preview"
4. You will a blank page instead of the print preview