Android Manifest issues?

Hi,

I've been trying to build my application to Android and this is the error I keep getting:

 NullReferenceException: Object reference not set to an instance of an object
 UnityEditor.AndroidManifest.SetApplicationFlag (System.String name, Boolean value)
 UnityEditor.AndroidManifest.SetDebuggable (Boolean debuggable)
 UnityEditor.Android.PostProcessor.Tasks.GenerateManifest.PatchManifest (UnityEditor.Android.PostProcessor.PostProcessorContext context, System.String manifest)
 UnityEditor.Android.PostProcessor.Tasks.GenerateManifest.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
 UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
 UnityEditor.Android.PostProcessAndroidPlayer.PostProcess (BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry)
 UnityEditor.Android.AndroidBuildPostprocessor.PostProcess (BuildPostProcessArgs args)
 UnityEditor.PostprocessBuildPlayer.Postprocess (BuildTarget target, System.String installPath, System.String companyName, System.String productName, Int32 width, Int32 height, System.String downloadWebplayerUrl, System.String manualDownloadWebplayerUrl, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.BuildReporting.BuildReport report) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:186)
 UnityEditor.HostView:OnGUI()

Any suggestions for what's going on here? I'm using Unity 5.5.0f3 Personal.