AutoSPInstaller error – Custom file location is not accessible

While installing SharePoint 2019 with AutoSPInstaller () I encountered the following error:

Error: Custom file location is not accessible

This was a simple oversight on my part – I was running the installer in offline mode and neglected to copy the pre-requisite installers into the AutoSPInstaller\SP\2019\SharePoint\prerequisiteinstallerfiles folder.  Once I had done this the installation continued.

Alternatively, if the server has internet access, set the OfflineInstall value from true to false in the XML file.