android - 初始化任务 PropertyGroup : Not registered task PropertyGroup 时出错

Question

我一直在使用 Xamarin 开发 Android 应用程序。直到今天我更新 Xamarin 和 Android-SDK 时它一直运行良好，突然我收到以下错误消息:

“初始化任务 PropertyGroup 时出错:未注册任务 PropertyGroup。”

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    <WarningLevel>4</WarningLevel>
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    <Compile Include="Activities\CustomerAliasActivity.cs" />
    <Compile Include="Activities\LoadSettingsActivity.cs" />
    <Compile Include="Activities\LoadingObjectsActivity.cs" />
    <Compile Include="Activities\ObjectListActivity.cs" />
    <Compile Include="Activities\ObjectDetailsActivity.cs" />
    <Compile Include="Activities\LoadingInspectionsActivity.cs" />
    <Compile Include="Activities\InspectionListActivity.cs" />
    <Compile Include="Activities\InspectionDetailsActivity.cs" />
    <Compile Include="Activities\AboutActivity.cs" />
    <Compile Include="Activities\ChooseUserActivity.cs" />
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    <AndroidResource Include="Resources\layout\Login.axml" />
    <AndroidResource Include="Resources\values\Colors.xml" />
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    <AndroidResource Include="Resources\layout\LoadingObjects.axml" />
    <AndroidResource Include="Resources\layout\ObjectDetails.axml" />
    <AndroidResource Include="Resources\layout\LoadingSettings.axml" />
    <AndroidResource Include="Resources\layout\LoadingInspections.axml" />
    <AndroidResource Include="Resources\layout\InspectionDetails.axml" />
    <AndroidResource Include="Resources\layout\About.axml" />
    <AndroidResource Include="Resources\drawable\bg_property_description.xml" />
    <AndroidResource Include="Resources\drawable\bg_property_position_info.xml" />
    <AndroidResource Include="Resources\drawable\expandablegroup_gradient.xml" />
    <AndroidResource Include="Resources\drawable\expandablegroup_title_gradient.xml" />
    <AndroidResource Include="Resources\drawable\expandablegroup_vertical_gradient.xml" />
    <AndroidResource Include="Resources\drawable\ic_checkbox.xml" />
    <AndroidResource Include="Resources\drawable\ic_radio.xml" />
    <AndroidResource Include="Resources\drawable\login_background.xml" />
    <AndroidResource Include="Resources\drawable\slidingmenu_background.xml" />
    <AndroidResource Include="Resources\drawable\slidingmenu_item_background.xml" />
    <AndroidResource Include="Resources\drawable\slidingmenu_item_color.xml" />
    <AndroidResource Include="Resources\drawable\slidingmenu_item_subtext_color.xml" />
    <AndroidResource Include="Resources\drawable\slidingmenu_item_text_color.xml" />
    <AndroidResource Include="Resources\drawable\slidingmenu_shadows.xml" />
    <AndroidResource Include="Resources\drawable\upgrade_button_background.xml" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_cancel.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_create_inspection.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_create_object.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_delete.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_details.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_done.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_done_holo_light.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_edit.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_get_position.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_messages.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_new_messages.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_object.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_action_refresh.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_checkbox_checked.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_checkbox_unchecked.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_coordinate.png" />
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    <AndroidResource Include="Resources\drawable-hdpi\ic_delete.png" />
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    <AndroidResource Include="Resources\drawable-hdpi\ic_image_missing.png" />
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    <AndroidResource Include="Resources\drawable-hdpi\ic_list_sync_on.png" />
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    <AndroidResource Include="Resources\drawable-hdpi\ic_list_unsynchronized.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_logout.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_mandatory.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_mandatory_large.png" />
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    <AndroidResource Include="Resources\drawable-hdpi\ic_object_list.png" />
    <AndroidResource Include="Resources\drawable-hdpi\ic_radio_checked.png" />
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    <AndroidResource Include="Resources\drawable-mdpi\ic_action_cancel.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_action_copy.png" />
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    <AndroidResource Include="Resources\drawable-mdpi\ic_action_done_holo_light.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_action_edit.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_action_get_position.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_action_messages.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_action_new_messages.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_action_object.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_action_paste.png" />
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    <AndroidResource Include="Resources\drawable-mdpi\ic_action_user.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_checkbox_checked.png" />
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    <AndroidResource Include="Resources\drawable-mdpi\ic_coordinate.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_create_object.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_delete.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_edit.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_image.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_image_missing.png" />
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    <AndroidResource Include="Resources\drawable-mdpi\ic_inspection_list.png" />
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    <AndroidResource Include="Resources\drawable-mdpi\ic_list_finished.png" />
    <AndroidResource Include="Resources\drawable-mdpi\ic_list_locked.png" />
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    <AndroidResource Include="Resources\drawable-mdpi\ic_list_sync_on.png" />
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    <Folder Include="Resources\drawable-xhdpi\" />
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Answer 1

您需要使用 Mono 3.2(或更高版本)，因为 Xamarin.Android 4.8 使用与需要 Mono 3.2 的先前版本不同的编译器。 (积分归 Cheesebaron)