Unity 3 Build and Build & Run does not work, why?

Hello there,
I wanted to test the game and build it, but I can’t. If I press Build or Build&Run for Windows I get the following error shown and nothing else happens.

Could someone help me out? Thank you

MissingMethodException: Cannot find the requested method.
UnityEditor.BuildPlayerWindow.BuildPlayerWithDefaultSettings (Boolean askForBuildLocation, BuildOptions forceOptions, Boolean first) (at C:/BuildAgent/work/300357e52574df36/Editor/Mono/BuildPlayerWindow.cs:428)
UnityEditor.BuildPlayerWindow.BuildPlayerWithDefaultSettings (Boolean askForBuildLocation, BuildOptions forceOptions) (at C:/BuildAgent/work/300357e52574df36/Editor/Mono/BuildPlayerWindow.cs:412)
UnityEditor.BuildPlayerWindow.GUIBuildButtons (Boolean enableBuildButton, Boolean enableBuildAndRunButton, Boolean canInstallInBuildFolder) (at C:/BuildAgent/work/300357e52574df36/Editor/Mono/BuildPlayerWindow.cs:1222)
UnityEditor.BuildPlayerWindow.ShowBuildTargetSettings () (at C:/BuildAgent/work/300357e52574df36/Editor/Mono/BuildPlayerWindow.cs:1203)
UnityEditor.BuildPlayerWindow.OnGUI () (at C:/BuildAgent/work/300357e52574df36/Editor/Mono/BuildPlayerWindow.cs:899)
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object parameters, System.Globalization.CultureInfo culture)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object parameters, System.Globalization.CultureInfo culture)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object parameters)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/BuildAgent/work/300357e52574df36/Editor/Mono/GUI/DockArea.cs:228)
UnityEditor.HostView.Invoke (System.String methodName) (at C:/BuildAgent/work/300357e52574df36/Editor/Mono/GUI/DockArea.cs:221)
UnityEditor.HostView.OnGUI () (at C:/BuildAgent/work/300357e52574df36/Editor/Mono/GUI/DockArea.cs:121)

have u added the scene to the build