Xamarin - Binary XML file line #1: Error inflating class <unknown>

I am currently developing a small Android app in Xamarin, using C#.
The following shows up when I run it on my emulator:

This line of code is called when the first tab is selected, which is by default, meaning that this error occurs as soon as I run the program. The XML snippet which seems to be causing the error is this, in one of my layout files:

android:background="@color/done"

This is in line 111 of Dialer.axml, the entirety of which is below. Here, I am trying to reference a color state list for my button, so that the color changes depending on whether it is being touched or not. I know that this line causes the error, because removing it from the button tag which it's in causes the program to run perfectly. Here is the code for done.xml, in my color folder:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:color="#ff2222ff"/>
    <item android:state_pressed="true" android:state_enabled="false" android:color="#ff4444ff"/>
    <item android:state_enabled="false" android:color="#ff000000"/>
    <item android:color="#ff0000ff"/>
</selector>

And here is the code for Dialer.axml:

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="25px"
    android:minHeight="25px"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/tableLayout1"
    android:background="#2ec0ff">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="50sp"
        android:layout_marginBottom="40sp"
        android:id="@+id/number"
        android:editable="false"
        android:singleLine="true"
        android:scrollHorizontally="true"
        android:gravity="right"
        android:textColor="#fff" />
    <TableRow
        android:id="@+id/tableRow1"
        android:layout_weight="1">
        <Button
            android:text="1"
            android:layout_column="0"
            android:id="@+id/button1"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <Button
            android:text="2"
            android:layout_column="1"
            android:id="@+id/button2"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <Button
            android:text="3"
            android:layout_column="2"
            android:id="@+id/button3"
            android:layout_weight="1"
            android:layout_height="match_parent" />
    </TableRow>
    <TableRow
        android:id="@+id/tableRow2"
        android:layout_weight="1">
        <Button
            android:text="4"
            android:layout_column="0"
            android:id="@+id/button4"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <Button
            android:text="5"
            android:layout_column="1"
            android:id="@+id/button5"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <Button
            android:text="6"
            android:layout_column="2"
            android:id="@+id/button6"
            android:layout_weight="1"
            android:layout_height="match_parent" />
    </TableRow>
    <TableRow
        android:id="@+id/tableRow3"
        android:layout_weight="1">
        <Button
            android:text="7"
            android:layout_column="0"
            android:id="@+id/button7"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <Button
            android:text="8"
            android:layout_column="1"
            android:id="@+id/button8"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <Button
            android:text="9"
            android:layout_column="2"
            android:id="@+id/button9"
            android:layout_weight="1"
            android:layout_height="match_parent" />
    </TableRow>
    <TableRow
        android:id="@+id/tableRow4"
        android:layout_weight="1">
        <Button
            android:text="*"
            android:layout_column="0"
            android:id="@+id/buttonStar"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <Button
            android:text="0"
            android:layout_column="1"
            android:id="@+id/button0"
            android:layout_weight="1"
            android:layout_height="match_parent" />
        <Button
            android:text="#"
            android:layout_column="2"
            android:id="@+id/buttonPound"
            android:layout_weight="1"
            android:layout_height="match_parent" />
    </TableRow>
    <Button
        android:text="Done"
        android:id="@+id/buttonDone"
        android:background="@color/done"
        android:layout_width="match_parent"
        android:layout_height="80sp"
        android:textSize="35sp"
        android:layout_margin="5sp" />
</TableLayout>

What is causing the error? Am I referencing done.xml incorrectly? Did I place it in the wrong folder?

Thanks in advance.