Everything's fine and I fixed the code! Thanks for everyone who helped me with this issue!

Okay so I rewrote the whole code and now everything kinda works but the only problem is that the blip disappears once it's out of the player's FoV even though I set newBlip.IsShortRange to false.

Here's the new code: https://pastebin.com/b1SgBL4B

@Jitnaught So I added UI.ShowSubtitle(Target.ToString()); Under Target = Game.Player.GetTargetedEntity(); and it said GTA.Vehicle (was a car) so that worked.

@Jitnaught I added UI.ShowSubtitle(newBlip.toString()); under Blip newBlip = Target.addBlip(); and it did nothing

@Jitnaught Okay so I've got good news and bad news.

Good news: No Errors from the script.
Bad news: The blip doesn't show up.

@Jitnaught Okay

@Jitnaught there you go https://pastebin.com/qEw79Ldc

So I combined @ikt and @Jitnaught 's code and i'm still getting the same error.

[ERROR] Caught unhandled exception:
System.NullReferenceException: Object reference not set to an instance of an object.
   at TrackersV.TrackersV.AddPlayerBlip()
   at TrackersV.TrackersV.OnKeyDown(Object source, KeyEventArgs e)
   at GTA.Script.raise_KeyDown(Object value0, KeyEventArgs value1)
   at GTA.Script.MainLoop()

@ikt Still same error:

system.NullReferenceException: Object reference not set to an instance of an object.
at TrackersV.TrackersV.AddPlayerBlip()
at TrackersV.TrackersV.OnKeyDown(Object source, KeyEventArgs e)
at GTA.Script.raise_KeyDown(Object value0, KeyEventArgs value1)
at GTA.Script.MainLoop()