Error in unity help.

[miroslav042999]

First off all I wana ask where is the best place to search for errors and how to fix them?
now this is my current error I cant seem to solve.

NullReferenceException: Object reference not set to an instance of an object
FPSCounter+d__14.MoveNext () (at Assets/NVJOB Water Shader SAF/Example Scenes/FPS Counter/FPSCounter.cs:93)
UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Scripting/Coroutines.cs:17)

[JeffDUnity3D]

Show the code that you are using that generates the error, you have the exact line numbers (93 and 17).