当我尝试在Qt creator for android中构建我的项目时，会出现以下错误：
Warning: QML import could not be resolved in any of the import paths: Qt.Class
Warning: QML import could not be resolved in any of the import paths: QtQuick.Extras.Private.CppUtils
Warning: QML import could not be resolved in any of the import paths: QtQuick.Extras.Private.CppUtils
Warning: QML import could not be resolved in any of the import paths: QtQuick.Controls.Material.impl
Warning: QML import could not be resolved in any of the import paths: QtQuick.Controls.impl
Warning: QML import could not be resolved in any of the import paths: QtQuick.Controls.Universal.impl
FAILURE: Build failed with an exception.
这是我的.pro文件内容：
QT += qml quick
CONFIG += c++11
SOURCES += main.cpp \
downloader.cpp \
filemanager.cpp
HEADERS += \
downloader.h \
filemanager.h
RESOURCES += qml.qrc
QT += network
QT += xml
QT += gui
# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH = /home/muhammad/Qt5.9.0/5.9/android_armv7/qml/
# Additional import path used to resolve QML modules just for Qt Quick Designer
#QML_DESIGNER_IMPORT_PATH =
# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
DISTFILES += \
android/AndroidManifest.xml \
android/gradle/wrapper/gradle-wrapper.jar \
android/gradlew \
android/res/values/libs.xml \
android/build.gradle \
android/gradle/wrapper/gradle-wrapper.properties \
android/gradlew.bat \
android/AndroidManifest.xml \
android/gradle/wrapper/gradle-wrapper.jar \
android/gradlew \
android/res/values/libs.xml \
android/build.gradle \
android/gradle/wrapper/gradle-wrapper.properties \
android/gradlew.bat
ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android
我该如何解决？