Android: Cannot register existing type 'GstSoupHttpClientSink'

[wbonnefond]

I have made some modifications to souphttpclientsink and would like to
include them in my Android app. I've locally copied, modified and renamed
souphttpclientsink.c/.h -> customsouphttpclientsink.c/.h, and gstsouputils.h
into my Android project source folder. Initially I was unable to build the
project because these files could not find <libsoup/soup.h>.  I ended up
having to include libsoup-2.4 in my Android.mk and then it built. However,
when running my application I get the following error when trying to
register my new plugin: "cannot register existing type
'GstSoupHttpClientSink'".  I've looked all over and most forum posts say
that it is because both GStreamer 1.0 and 0.10 are installed.  That is not
the case though, I have only ever had GStreamer 1.0 versions installed
(currently using 1.8.0, but have 1.6.2, 1.8.2 and 1.10.2 on my computer).
Does anyone know what could be causing me to run into this issue?  For
reference I am on macOS Sierra, 10.12.2 and am using ndk-r10e. My Android.mk
is below: 

LOCAL_PATH := $(call my-dir)
SHELL := PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin /bin/bash
include $(CLEAR_VARS)
LOCAL_MODULE := video-streamer
FILE_LIST := $(wildcard $(LOCAL_PATH)/*.cpp)
FILE_LIST += $(wildcard $(LOCAL_PATH)/*.c)
LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)
LOCAL_SHARED_LIBRARIES := gstreamer_android
LOCAL_LDLIBS := -llog -landroid -latomic
LOCAL_CPPFLAGS += -std=c++11 -frtti -fexceptions
include $(BUILD_SHARED_LIBRARY)
ifeq ($(TARGET_ARCH_ABI),armeabi)
    GSTREAMER_ROOT := $(GSTREAMER_ROOT_ARM)
else ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
    GSTREAMER_ROOT := $(GSTREAMER_ROOT_ARMV7)
else ifeq ($(TARGET_ARCH_ABI),x86)
    GSTREAMER_ROOT := $(GSTREAMER_ROOT_X86)
else
    $(error Target arch ABI $(TARGET_ARCH_ABI) not supported)
endif
GSTREAMER_NDK_BUILD_PATH := $(GSTREAMER_ROOT)/share/gst-android/ndk-build
include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk
GSTREAMER_PLUGINS := $(GSTREAMER_PLUGINS_CORE) $(GSTREAMER_PLUGINS_NET)
$(GSTREAMER_PLUGINS_ENCODING) $(GSTREAMER_PLUGINS_SYS) mulaw
G_IO_MODULES              := gnutls
GSTREAMER_EXTRA_DEPS := gstreamer-video-1.0 libsoup-2.4
GSTREAMER_INCLUDE_FONTS := no
include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer-1.0.mk



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