To solve this error when importing files from your iPhone or iPad to your PC/computer running Windows 10, here are steps to follow:
- Disconnect your iPhone/iPad from your computer
- Go to Settings on your iOS device
- Open Photos and scroll to the bottom
- Under ‘Transfer to Mac or PC’, change from Automatic to Keep Originals

Now connect again the device to the Windows 10 computer and import the files within Phototheca again; it should work fine now!