Error building AIDL files as part of build

Created by: amitkot

I have a couple of AIDL files in a directory that contains both them and Java files. Following the AntennaPod tutorial, I created the following BUCK file for my project:

import re

jar_deps = []
for jarfile in glob(['libs/*.jar']):
    name = 'jars__' + re.sub(r'^.*/([^/]+)\.jar$', r'\1', jarfile)
    jar_deps.append(':' + name)
    prebuilt_jar(
        name = name,
        binary_jar = jarfile,
    )

android_library(
    name = 'all-jars',
    exported_deps = jar_deps,
)

proj_gen_aidls = []
for aidlfile in glob(['src/main/java/**/*.aidl']):
    name = 'proj_aidls__' + re.sub(r'^.*/([^/]+)\.aidl$', r'\1', aidlfile)
    proj_gen_aidls.append(':' + name)
    gen_aidl(
        name = name,
        aidl = aidlfile,
        import_path = 'src',
)

android_library(
    name = 'proj-aidls',
    srcs = proj_gen_aidls,
)

android_build_config(
    name = 'build-config',
    package = 'com.mobile.proj',
)


android_resource(
    name = 'res',
    package = 'com.mobile.proj',
    res = 'res',
    assets = 'assets',
    deps = [
    ]
)

android_library(
    name = 'main-lib',
    srcs = glob(['src/main/java/**/*.java']),
    deps = [
        ':all-jars',
        ':proj-aidls',
        ':build-config',
        ':res',
    ],
)

keystore(
    name = 'debug_keystore',
    store = 'keystore/debug.keystore',
    properties = 'keystore/debug.keystore.properties',
)

android_binary(
    name = 'proj',
    manifest = 'AndroidManifest.xml',
    target = 'android-10',
    keystore = ':debug_keystore',
    deps = [
        ':main-lib',
    ],
)

When I run buck build proj I get the following errors:

src/main/java/com/mobile/proj/domain/VehicleState.aidl:4 aidl can only generate code for interfaces, not parcelables or flattenables,
src/main/java/com/mobile/proj/domain/VehicleState.aidl:4 .aidl files that only declare parcelables or flattenablesmay not go in the Makefile.
src/main/java/com/mobile/proj/be/api/ControlService.aidl:3: couldn't find import for class com.mobile.proj.domain.TripState
src/main/java/com/mobile/proj/be/api/ControlService.aidl:4: couldn't find import for class com.mobile.proj.domain.BackendServiceState
src/main/java/com/mobile/proj/be/api/ControlService.aidl:5: couldn't find import for class com.mobile.proj.domain.VehicleState
src/main/java/com/mobile/proj/domain/BackendServiceState.aidl:4 aidl can only generate code for interfaces, not parcelables or flattenables,
src/main/java/com/mobile/proj/domain/BackendServiceState.aidl:4 .aidl files that only declare parcelables or flattenablesmay not go in the Makefile.
src/main/java/com/mobile/proj/domain/TripState.aidl:4 aidl can only generate code for interfaces, not parcelables or flattenables,
src/main/java/com/mobile/proj/domain/TripState.aidl:4 .aidl files that only declare parcelables or flattenablesmay not go in the Makefile.
BUILD FAILED: //:proj_aidls__VehicleState failed with exit code 1:
aidl

Any ideas?