Can't Install an Android Application ERROR "Installation did not succeed"

Question

I was Working to my project suddly while I was testing this Error Apears:

Installation did not succeed. The application could not be installed: INSTALL_PARSE_FAILED_MANIFEST_MALFORMED

This Is the Android Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.ymmyserver">

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.Ymmy">
    <activity android:name=".FoodList"></activity>
    <activity
        android:name=".Home"
        android:label="@string/title_activity_home"
        android:theme="@style/Theme.Ymmy.NoActionBar"></activity>
    <activity android:name=".SignIn" />
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

I Didn't change any thing with the manifest file