make a Tower Defense Game, NullReferenceException

Updated on January 26, 2017 in [A] Tutorials
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0 on January 26, 2017

Hi I m on the “How to make a Tower Defense Game (E08 SHOP) – Unity Tutorial” and at about 20:00 when I try the game and go over the nodes to place a turret I get this error for each one I go over:

– NullReferenceException: Object reference not set to an instance of an object
Node.OnMouseEnter () (at Assets/Script/Node.cs:41)
UnityEngine.SendMouseEvents:DoSendMouseEvents(Int32)

-NullReferenceException: Object reference not set to an instance of an object
Node.OnMouseDown () (at Assets/Script/Node.cs:25)
UnityEngine.SendMouseEvents:DoSendMouseEvents(Int32)

it doesn’t change color when and I cant place a turret even thought it tells me “Another Turret purchased!”.
it seems like it has to do something with this line:

–  if (buildManager.GetTurretToBuild() == null)
return;

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