Entity Spawning Error

I am trying to get a jeep to spawn upon a player joining, but everytime I join I get spammed with this error in console:


Bad pstudiohdr in GetSequenceLinearMotion()!

Here is my function for spawning the jeeps:
[lua]function GM:PlayerInitialSpawn( pl )
local Jeep = ents.Create( “prop_vehicle_jeep” )
if !pl:GetPData( “JeepData” ) then
pl:SetPData( “JeepData” )
pl:PrintMessage( HUD_PRINTTALK, “File Created” )
else
pl:GetPData( “JeepData” )
pl:PrintMessage( HUD_PRINTTALK, “File Loaded” )
Jeep:SetPos( Vector( 785, 421, 128 ) )
Jeep:SetAngles( Angle( 1, 89, 0 ) )
Jeep:SetKeyValue( “vehiclescript”, “scripts/vehicles/jeep.txt” )
Jeep:Spawn()
Jeep:Activate()
end
end[/lua]