gscan2pdf worked well when initially installing it. However, today, as soon as I launch it, I get these error messages. Note: It is connected to power & usb cords properly...

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Does it do anything if you click the "Rescan for devices" option?

I just tried and got a similar result.

After doing a bit of searching and looking at both your image and mine I saw the same thing.
`Cache device list` was checked.

I found that since I had recently changed ISP and my local network subnet had changed, the cached address for the network scanner was different than expected so it refused to connect. Xsane also would not connect for the same reason. I turned off the `cache device list` as well so gscan2pdf now always scans for devices instead of only using the cached device.

I had to do 2 things.
1. I had to reconfigure the printer since the config still showed the old address, even though dhcp had been managed and had assigned the new address.
2. I had to manually edit the ~/.config/gscan2pdfrc file and change the saved IP address there to match the new printer IP. That file contains the cached data for gscan2pdf.

Once I fixed those 2 hanging changes that I had overlooked then the printer would now work again and the scanner worked again for both Xsane and gscan2pdf.

1 members found this post helpful.

Would be nice if someone would incorporate these fixes into an update.... I suspect a lot of non-technical users, such as myself, are having problems....