Compilation failed; see the compiler error output for details

I am practicing android studio when I try to run my project I get the following error:

  

Compilation failed; see the compiler error output for details.

besides that it shows me a x where you select app.

I am new to this, please help.

this is my buildgradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.deivi.fastfood"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

I have everything installed