android Studio debubbing -

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I'm learning content design with developers. Android Com but I did the exact same way that card_view should be done. I only received this error:

"found in the package for a resource identifier attribute 'cardCornerRadius' 'com.google.example.test_app'"

This is my code I Used to be.

`

  & lt; Android.support.v7.widget.CardView xmlns: card_view = "http://schemas.android.com/apk/res-auto" Android: id = "@ + id / card_view" Android: layout_width = "200dp" Android: Layout_height = "200dp" Android: layout_gravity = "center" Android: background = "# FFF" card_view: cardCornerRadius = "4dp" & gt; & Lt; Android: layout_height = "wrap_content" android: text = "@ string / next" Android: background = "#FFF" Android: height = "5: TextView Android: id =" @ + id / my_textview "Android: layout_width =" wrap_content " DP "/> & Lt; / Android.support.v7.widget.CardView & gt; `

Does anyone know what I am doing wrong? Thanks in front of


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