Well besides the fact that you have a ton of console errors from badly coded add-ons
Loading Add-On: Vehicle_SpeedKart (CRC:1712090097)
Executing Add-Ons/Vehicle_SpeedKart/server.cs.
Executing Add-Ons/Vehicle_SpeedKart/support_vehicleHorns.cs.
Activating package: vehicleHornSupportPackage
ProjectileData - NoProjectile(1903) - invalid value for lightRadius: Must be between 1 and 20
Activating package: SpeedKartHandPackage
62 datablocks added.
Disable this and then try.
My honest answer is to back up your blockland add-ons folder, and start with a fresh install.
Even if you tried with only default add-ons there are still add-ons that load even when in the folder and not enabled in the menu.
Start with a fresh install, go through your backed addons folder and only transfer the ones without console errors. This will eliminate problem add-ons so we can narrow down on the solution.
Seriously though bro, your add-ons folder needs cleaned up, you have a ton of errors!