Android Question msg error


New Member
hello friends. i am a beginner with B42. in compilation I got this msg:

B4A Version : 9.30
Java Version : 12
Analyse du code. (0.00s)
Building folders structure. (0.05s)
Compilation du code. (0.10s)
Compilation du code des layouts. (0.04s)
Organiser les bibliothèques. (0.00s)
(Android Support Library)
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'.

plz help