Issue with darks - plate solving message

I have an existing sequence and wanted to add Darks. Ive tried a couple of ways - appending darks to an existing target and adding Darks as a new target in its own right. FOr some reason when I hit run I get a message regarding the sequence need plate solving etc - see screenshot. Not sure why this is relevant for darks and what I can do to resolve it.

Cal frames should not bother you about that stuff. I’ll have that fixed in the next version. In the meantime, you can just enter any number for the camera’s scale.

Cheers Ken. I did just that ( for some reason the profile I thought was attached to the sequence did have a scale figure but it didn’t show in the actual options view)