Debug in Android Studio

[Aulia_R_]

hi intel, I am a beginner in programming.
I had a problem in android studio when debugging

What should I do ?

Error:(18) No resource identifier found for attribute 'layout_marginButtom' in package 'android'

Error:(18) Execution failed for task ':app:processDebugResources'.
> com.android.ide.common.internal.LoggedErrorException: Failed to run command:
    C:\Users\user\AppData\Local\Android\sdk\build-tools\21.1.2\aapt.exe package -f --no-crunch -I C:\Users\user\AppData\Local\Android\sdk\platforms\android-21\android.jar -M C:\Users\user\AndroidStudioProjects\HitungLuas\app\build\intermediates\manifests\full\debug\AndroidManifest.xml -S C:\Users\user\AndroidStudioProjects\HitungLuas\app\build\intermediates\res\debug -A C:\Users\user\AndroidStudioProjects\HitungLuas\app\build\intermediates\assets\debug -m -J C:\Users\user\AndroidStudioProjects\HitungLuas\app\build\generated\source\r\debug -F C:\Users\user\AndroidStudioProjects\HitungLuas\app\build\intermediates\res\resources-debug.ap_ --debug-mode --custom-package com.rosiana.aulia.hitungluas -0 apk --output-text-symbols C:\Users\user\AndroidStudioProjects\HitungLuas\app\build\intermediates\symbols\debug
Error Code:
    1
Output:
    C:\Users\user\AndroidStudioProjects\HitungLuas\app\build\intermediates\res\debug\layout\activity_main.xml:18: error: No resource identifier found for attribute 'layout_marginButtom' in package 'android'

[PaulF_IntelCorp]

This is not a good forum for help with the Android Studio debugger. I recommend you try StackOverflow.