Here’s the error message:

UnityEditor.BuildPlayerWindow+BuildMethodException: 3 errors at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002bb] in <2f1c602eae0d45c293fff3e3aef759fa>:0 at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in <2f1c602eae0d45c293fff3e3aef759fa>:0 UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Solution:

This error is actually occuribg due to incorrect keystore password. Chek your password and try again, it will work.