Error building Player because scripts had compiler errors - Nothing else given

Hi All,
What steps can be taken when a build fails but gives no reason?

Error building Player because scripts had compiler errors
Build completed with a result of 'Failed'
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
UnityEditor.BuildPlayerWindow+BuildMethodException: Error building Player because scripts had compiler errors
  at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x0020e] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:181 
  at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x00065] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:88 
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

I have previously fixed this problem with the following, but have tried them with no success this time.

  • Close/Open Unity
  • Remove the Temp Folder
  • Reopen, and look for Errors/Warnings given only when first launching the project Re-Import All
  • Run “Reimport All”

Are there any others to try?

In this case the error could only be found in the Unity Editor LogFile . Searching it for “error” revealed a problem hidden amongst the Warnings.

when i try to delete it dose not let me