Android Question [RESOLVED] AppCompatToolbar1 - Error when compiling

B4A Version: 8.80
Parsing code.    (0.00s)
Building folders structure.    (0.06s)
Compiling code.    (0.03s)
  
ObfuscatorMap.txt file created in Objects folder.
Compiling layouts code.    (0.03s)
Organizing libraries.    (3.37s)
Generating R file.    (0.92s)
Compiling generated Java code.    Error
javac 1.8.0_181
src\de\amberhome\appcompat\toolbarexample1\main.java:332: error: cannot find symbol
public de.amberhome.objects.appcompat.AppCompatBase _v6 = null;
                                     ^
  symbol:   class AppCompatBase
  location: package de.amberhome.objects.appcompat
1 error