Having issue building apk

Hello, semi-newish to this and don’t understand how this error came about. I was able to build the apk properly a few weeks ago, no problems, but I took a break and when I came back to it today, I am unable to build the apk and I’m getting this new error.

CommandInvokationFailure: Failed to re-package resources. C:\Users\MYNAME\AppData\Local\Android\sdk\build-tools\27.0.0\aapt.exe package --auto-add-overlay -v -f -m -J "gen" -M "AndroidManifest.xml" -S "res" -I "C:/Users/MYNAME/AppData/Local/Android/sdk\platforms\android-23\android.jar"
-F bin/resources.ap_

stderr[ AndroidManifest.xml:5: error: Error: String types not allowed (at 'configChanges' with value 'mcc|mnc|locale|touchscreen|keyboard|keyboardHidden|navigation|orientation|screenLayout|uiMode|screenSize|smallestScreenSize|fontScale|layoutDirection|density').

] stdout[ Configurations:  (default)  v14  v21  mdpi-v4  xhdpi-v4

Files:   drawable\app_banner.png
    Src: (xhdpi-v4) res\drawable-xhdpi\app_banner.png   drawable\app_icon.png
    Src: (mdpi-v4) res\drawable-mdpi\app_icon.png   values\strings.xml
    Src: () res\values\strings.xml   values\styles.xml
    Src: () res\values\styles.xml
    Src: (v14) res\values-v14\styles.xml
    Src: (v21) res\values-v21\styles.xml   AndroidManifest.xml
    Src: () AndroidManifest.xml

Resource Dirs:   Type drawable
    drawable\app_banner.png
      Src: (xhdpi-v4) res\drawable-xhdpi\app_banner.png
    drawable\app_icon.png
      Src: (mdpi-v4) res\drawable-mdpi\app_icon.png   Type values
    values\strings.xml
      Src: () res\values\strings.xml
    values\styles.xml
      Src: () res\values\styles.xml
      Src: (v14) res\values-v14\styles.xml
      Src: (v21) res\values-v21\styles.xml Including resources from package: C:\Users\MYNAME\AppData\Local\Android\sdk\platforms\android-23\android.jar applyFileOverlay for drawable applyFileOverlay for layout applyFileOverlay for anim applyFileOverlay for animator applyFileOverlay for interpolator applyFileOverlay for transition applyFileOverlay for xml applyFileOverlay for raw applyFileOverlay for color applyFileOverlay for menu applyFileOverlay for font applyFileOverlay for mipmap Processing image: res\drawable-xhdpi\app_banner.png Processing image: res\drawable-mdpi\app_icon.png
    (processed image res\drawable-mdpi\app_icon.png: 90% size of source)
    (processed image res\drawable-xhdpi\app_banner.png: 93% size of source)
    (new resource id app_banner from xhdpi-v4\drawable\app_banner.png
#generated)
    (new resource id app_icon from mdpi-v4\drawable\app_icon.png
#generated) ] exit code: 1 UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.PostProcessor.Tasks.TasksCommon.Exec (System.String command, System.String args, System.String workingdir, System.String errorMsg) UnityEditor.Android.PostProcessor.Tasks.BuildResources.CompileResources (UnityEditor.Android.PostProcessor.PostProcessorContext context) UnityEditor.Android.PostProcessor.Tasks.BuildResources.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()

I have NDK and SDK setup properly, and I was able to build the apk a few weeks ago. I have no idea what happened. :\

Does no one have any idea?