Error calculating cross section data

Hello Guys,

I’m new to drone deploy and drone mapping and I just made my first map! Hurray!

I tried measuring distance on the map which I expected it would provide cross section of the the line with the distance but it keep s returning “Error calculating cross section data”.
Any Idea why? or could it be that its due to the fact that not all the photos were collected using drone deploy app?

Thanks for your reply