请帮忙。
我的 kivy 程序在桌面上运行完美（Mac OS，使用 buildozer 和 Android-new 工具链）。
但是，一旦我构建了 APK 并在 android Emulator (Andyroid) 上对其进行了测试，我在 logcat 中收到以下关于我导入的用户类的错误。我需要在规范文件中的某处指定它吗？
D/HostConnection( 1738): HostConnection::get() New Host Connection established 0xb7f2d2b0, tid 1865
I/python ( 1738): [INFO ] [GL ] OpenGL version <OpenGL ES 2.0>
I/python ( 1738): [INFO ] [GL ] OpenGL vendor <Imagination Technologies>
I/python ( 1738): [INFO ] [GL ] OpenGL renderer <PowerVR SGX 544MP>
I/python ( 1738): [INFO ] [GL ] OpenGL parsed version: 2, 0
I/python ( 1738): [INFO ] [GL ] Texture max size <8192>
I/python ( 1738): [INFO ] [GL ] Texture max units <16>
I/python ( 1738): [INFO ] [Window ] auto add sdl2 input provider
I/python ( 1738): [INFO ] [Window ] virtual keyboard not allowed, single mode, not docked
D/AndroidRuntime( 2115):
D/AndroidRuntime( 2115): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
D/AndroidRuntime( 2115): CheckJNI is OFF
D/dalvikvm( 2115): Trying to load lib libjavacore.so 0x0
D/dalvikvm( 2115): Added shared lib libjavacore.so 0x0
D/dalvikvm( 2115): Trying to load lib libnativehelper.so 0x0
D/dalvikvm( 2115): Added shared lib libnativehelper.so 0x0
D/AndroidRuntime( 2115): Calling main entry com.android.commands.settings.SettingsCmd
D/dalvikvm( 2115): Note: class Landroid/app/ActivityManagerNative; has 157 unimplemented (abstract) methods
D/AndroidRuntime( 2115): Shutting down VM
D/SettingsProvider( 2213): User 0 external modification to /data/data/com.android.providers.settings/databases/settings.db; event=8
D/SettingsProvider( 2213): User 0 updating our caches for /data/data/com.android.providers.settings/databases/settings.db
I/python ( 1738): Traceback (most recent call last):
I/python ( 1738): File "main.py", line 72, in <module>
I/python ( 1738): from user import User
I/python ( 1738): ImportError: cannot import name User
I/python ( 1738): Python for android ended.
I/HostConnection( 1738): ~HostConnection
V/SDL ( 1738): onPause()
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause__
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause__
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause__
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause__
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause__
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause__
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause__
E/dalvikvm( 1738): Loading ARM symbol: Java_org_libsdl_app_SDLActivity_nativePause
V/SDL ( 1738): nativePause()
F/libc ( 1738): Fatal signal 11 (SIGSEGV) at 0x00000004 (code=1), thread 1738 (rg.test.rides16)
I/DEBUG ( 1315): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
来自 main.py 的片段
from user import User
from category import Category
from advert import Advert
from attending import Attending