Android Question Copied from one computer to another, now error

I copied everything from one computer to another. Both running B4A V8. Now, when debugging, I get this.
B4A Version: 8.00
Parsing code. (0.02s)
Compiling code. (0.25s)
Compiling layouts code. (0.01s)
Organizing libraries. (0.00s)
Generating R file. 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'.

What did I miss?