我得到了一个错误，这是我的XML文件

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".BMIActivity">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar_bmi_activity"
        android:layout_width="match_parent"
        android:layout_height="?android:attr/actionBarSize"
        android:background="#FFFFFF" />

    <RadioGroup
        android:id="@+id/rgUnits"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/toolbar_bmi_activity"
        android:layout_margin="10dp"
        android:background="@drawable/drawable_radio_group_tab_background"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/rbMetricUnits"
            android:layout_width="0dp"
            android:layout_height="35dp"
            android:layout_weight="0.50"
            android:background="@drawable/drawable_units_tab_selector"
            android:button="@null"
            android:checked="true"
            android:gravity="center"
            android:text="METRIC UNITS"
            android:textColor="@drawable/drawable_units_tab_text_color_selector"
            android:textSize="16sp"
            android:textStyle="bold" />

        <RadioButton
            android:id="@+id/rbUsUnits"
            android:layout_width="0dp"
            android:layout_height="35dp"
            android:layout_weight="0.50"
            android:background="@drawable/drawable_units_tab_selector"
            android:button="@null"
            android:checked="false"
            android:gravity="center"
            android:text="US UNITS"
            android:textColor="@drawable/drawable_units_tab_text_color_selector"
            android:textSize="16sp"
            android:textStyle="bold" />
    </RadioGroup>

    <LinearLayout
        android:id="@+id/llUnitsView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/rgUnits"
        android:orientation="vertical"
        android:padding="10dp">

        <LinearLayout
            android:id="@+id/llMetricUnitsView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/tilMetricUnitWeight"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <androidx.appcompat.widget.AppCompatEditText
                    android:id="@+id/etMetricUnitWeight"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="WEIGHT (in kg)"
                    android:inputType="numberDecimal"
                    android:textSize="16sp" />
            </com.google.android.material.textfield.TextInputLayout>

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/tilMetricUnitHeight"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp">

                <androidx.appcompat.widget.AppCompatEditText
                    android:id="@+id/etMetricUnitHeight"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="HEIGHT (in cm)"
                    android:inputType="numberDecimal"
                    android:textSize="16sp" />
            </com.google.android.material.textfield.TextInputLayout>
        </LinearLayout>

        <LinearLayout
            android:id="@+id/llUsUnitsView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:visibility="gone"
            tools:visibility="visible">

            <com.google.android.material.textfield.TextInputLayout
                android:id="@+id/tilUsUnitWeight"
                style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <androidx.appcompat.widget.AppCompatEditText
                    android:id="@+id/etUsUnitWeight"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="WEIGHT (in lbs)"
                    android:inputType="numberDecimal"
                    android:textSize="16sp" />
            </com.google.android.material.textfield.TextInputLayout>

            <LinearLayout
                android:id="@+id/llUsUnitsHeight"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:baselineAligned="false"
                android:orientation="horizontal">

                <com.google.android.material.textfield.TextInputLayout
                    android:id="@+id/tilUsUnitHeightFeet"
                    style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_marginEnd="5dp"
                    android:layout_weight="1">

                    <androidx.appcompat.widget.AppCompatEditText
                        android:id="@+id/etUsUnitHeightFeet"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:hint="Feet"
                        android:inputType="number"
                        android:textSize="16sp" />
                </com.google.android.material.textfield.TextInputLayout>

                <com.google.android.material.textfield.TextInputLayout
                    android:id="@+id/tilUsUnitHeightInch"
                    style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_marginStart="5dp"
                    android:layout_weight="1">

                    <androidx.appcompat.widget.AppCompatEditText
                        android:id="@+id/etUsUnitHeightInch"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:hint="Inch"
                        android:inputType="number"
                        android:textSize="16sp" />
                </com.google.android.material.textfield.TextInputLayout>

            </LinearLayout>
        </LinearLayout>

        <LinearLayout
            android:id="@+id/llDiplayBMIResult"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="25dp"
            android:orientation="vertical"
            android:visibility="visible"
            tools:visibility="visible">

            <TextView
                android:id="@+id/tvYourBMI"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:text="YOUR BMI"
                android:textAllCaps="true"
                android:visibility="invisible"
                android:textSize="16sp" />

            <TextView
                android:id="@+id/tvBMIValue"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="5dp"
                android:gravity="center"
                android:textSize="18sp"
                android:textStyle="bold"
                tools:text="15.00" />

            <TextView
                android:id="@+id/tvBMIType"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="5dp"
                android:gravity="center"
                android:textSize="18sp"
                tools:text="Normal" />

            <TextView
                android:id="@+id/tvBMIDescription"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="5dp"
                android:gravity="center"
                android:textSize="18sp"
                tools:text="Normal" />
        </LinearLayout>

        <Button
            android:id="@+id/btnCalculateUnits"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:layout_marginTop="35dp"
            android:background="@color/colorAccent"
            android:text="CALCULATE"
            android:textColor="#FFFFFF"
            android:textSize="18sp" />
    </LinearLayout>
</RelativeLayout>

这里是styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>
</resources>

我尝试将AppCompat更改为MaterialComponents，但它不起作用。但是当我指向LinearLayout标记（com.google.android.Material.TextField.TextInputLayout的父标记）时，它会用红线显示错误，当我移除LinearLayout标记时，它会消失。当我使用太多的LinearLayout堆栈时有什么问题吗？