Android Studio failed to create a java class

Android Studio does not allow me to create java classes within my project folder.

The last thing I did was to update the jdk of the version 1.7 to the version 1.8 since one of the libraries I have in my gradle asked me for it.

This is the error message that shows me when I try to create a class, and try several methods like delete the directory .AndroidStudio and reconfigure again but it remains the same.

This is my gradle file:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion "25.0.3"

    defaultConfig {
        applicationId "com.discomsc.eqbe"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
configurations.all {
    resolutionStrategy.force 'com.android.support:support-annotations:25.3.1'
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    androidTestCompile 'com.android.support.test:runner:0.5'
    compile 'com.android.support:design:26.0.0-alpha1'
    compile 'com.google.firebase:firebase-core:10.2.1'
    compile 'com.google.firebase:firebase-database:10.2.1'
    compile 'com.google.firebase:firebase-messaging:10.2.1'
    compile 'com.google.firebase:firebase-auth:10.2.1'
    compile 'com.google.android.gms:play-services-auth:11.0.4'
    compile 'com.github.bumptech.glide:glide:3.8.0'
    compile 'com.facebook.android:facebook-android-sdk:[4,5)'
}
apply plugin: 'com.google.gms.google-services'