'''
compile:
[javac] Compiling 1 source file to /home/jp/mifare_ai_extension/build/classes
[javac] warning: [options] bootstrap class path not set in conjunction with -source 8
[javac] warning: [options] source value 8 is obsolete and will be removed in a future release
[javac] warning: [options] target value 8 is obsolete and will be removed in a future release
[javac] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
[javac] Note: Annotation processing is enabled because one or more processors were found
[javac] on the class path. A future release of javac may disable annotation processing
[javac] unless at least one processor is specified by name (-processor), or a search
[javac] path is specified (--processor-path, --processor-module-path), or annotation
[javac] processing is enabled explicitly (-proc:only, -proc:full).
[javac] Use -Xlint:-options to suppress this message.
[javac] Use -proc:none to disable annotation processing.
[javac] warning: unknown enum constant ComponentCategory.UNINITIALIZED
[javac] reason: class file for com.google.appinventor.components.common.ComponentCategory not found
[javac] /home/jp/mifare_ai_extension/src/com/MifareExtension/MifareExtension.java:11: error: package com.google.appinventor.components.common does not exist
[javac] import com.google.appinventor.components.common.ComponentCategory;
[javac] ^
[javac] warning: unknown enum constant ComponentCategory.UNINITIALIZED
[javac] /home/jp/mifare_ai_extension/src/com/MifareExtension/MifareExtension.java:21: error: cannot find symbol
[javac] category = ComponentCategory.EXTENSION,
[javac] ^
[javac] symbol: variable ComponentCategory
[javac] 2 errors
[javac] 6 warnings
'''
Does anyone have an idea why the it can't find the app inventor libraries?