未找到默认活动,即使它已在清单中声明

我还没有在网上找到解决办法。我的所有活动都已声明,但Android Studio经常会告诉我它找不到它们。它并不总是发生,而且似乎是随机发生的。我已经清理,失效,重新启动,重建,有时这会得到修复,然后在一段时间后再次发生。我在项目团队中工作,我似乎是唯一一个有缺陷的人:

<?xml version="1.0" encoding="utf-8"?>
<manifest package="fall2018.csc2017.GameCentre"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<application
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.AppCompat.Light.NoActionBar">
    <activity android:name=".LoginActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".SlidingTiles.SlidingGameActivity" />
    <activity android:name=".Score.MenuScoreboardsActivity" />
    <activity android:name=".Score.UserScoreboardActivity" />
    <activity android:name=".Score.ScoreScreenActivity" />
    <activity android:name=".Score.GameScoreboardActivity" />
    <activity android:name=".GameLauncherActivity" />
    <activity android:name=".RegisterActivity" />
    <activity android:name=".SlidingTiles.SlidingTilesStartingActivity" />
    <activity android:name=".Simon.SimonGameActivity" />
    <activity android:name=".Simon.SimonStartingActivity" />
    <activity android:name=".ChooseDimensionActivity"></activity>
</application>

这是我的gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "fall2018.csc2017.GameCentre"
        minSdkVersion 27
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    testOptions {
        unitTests.returnDefaultValues = true
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'com.android.support:design:27.1.1'
    implementation 'com.android.support:support-v4:27.1.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}