Android Question r file generation


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B4A Version : 8.50
Analyse du code. (0.00s)
Building folders structure. (0.03s)
Compilation du code. (0.03s)
Compilation du code des layouts. (0.00s)
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Génération du fichier R. Error
res\values-v20\theme.xml:3: error: Error retrieving parent for item: No resource found that matches the given name '@android:style/Theme.Material'.
how to solve this please