Android Question Error On Compile

B4A Version: 8.50
Parsing code. (0.03s)
Building folders structure. (0.08s)
Compiling code. (0.09s)
Compiling layouts code. (0.05s)
Organizing libraries. (2.49s)
Generating R file. Error
Failed to generate resource table for split ''
C:\Users\u12994\Dropbox\Android Programming\ECAM Resets+2\Objects\bin\extra\res3\res\values-v28\values-v28.xml:7: error: Error: No resource found that matches the given name (at 'dialogCornerRadius' with value '?android:attr/dialogCornerRadius').

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