My First time learning 3d scanning

is there anybody here who uses 3D scanning for some of there blender models? This is my first time learning 3d scanning software. I'm using the software Regard3D on an iMac and used a samsung SM-J120W to take my images.When I tried to open my images into the software I got an error message that saids the focal length is known for too few pictures triangulation will fail use pictures with known focal length taken with cameras stored in the database. What does that even mean. I watched a video on youtube that show how to fix the problem by right clicking the software and pressing on show's package contents and open the contents folder and open the resource folder and right click the senor_database. cvs file and press open with and press textedit but I still don't understand.Is there anybody who is using this software and ran into this problem that can help me? and here are my images that I took with my samung phone