"This directory is not a mount point" error

When attempting a Device to Image process, following the instructions here I run into an error I can't find a solution for. I'm specifically trying to create an image of my windows install, and save it on a secondary drive currently in use for media storage in the same computer. When selecting the drive in question, SDA2, as the image repository I immediately get asked if I want to check and repair the partition, which the guide in question doesn't mention, after choosing not to check the partition (the drive has been working perfectly fine as far as I can tell and I don't want to risk deleting 2TiB of media), instead of being asked for a directory, I'm met with a console message that reads "This directory is not a mount point: /home/partimag", I'm attaching an image that shows the whole error in question.

Every instance of this error I can find online is met with "did you mount the drive properly?" which makes no sense to me, as there's no such action expected of the user up to this point, and if there is, it goes completely unmentioned in the guide on Clonezilla.org, and it goes unexplained in those support questions. As I said, the drive has been in use as a media drive for windows for a while now, and no special change has been done to it for this operation, as no such thing is mentioned in any guide as a required step.