You have not installed the FSPort and ST:R correctly.
You need to move the fsport_str folder one level up (into your main FS2 folder), and use a correct mod.ini which points at the fsport folder. You need to make sure that you have the FSPort 3.1.1 installed.
In addition, mv_fsport needs to be inside its own mod folder.
This looks OK, however, the game does not seem to find the fsport_mediavps folder or the fsport folder. Make sure those names match up.