我在尝试签署Gradle apk时遇到了代码错误。我不知道如何解决这个问题。如果你知道怎么做，请告诉我。
我的Gradle应用程序和Gradle控制台的错误消息：
dependencies {
compile('com.crashlytics.sdk.android:crashlytics:2.7.1@aar') {
transitive = true
}
implementation fileTree(include: ['*.jar'], dir: 'libs')
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support:design:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'de.hdodenhof:circleimageview:2.2.0'
implementation 'com.github.amlcurran.showcaseview:library:5.4.3'
//implementation 'com.squareup.retrofit2:retrofit:2.0.0-beta4'
//implementation 'com.squareup.retrofit2:converter-gson:2.0.0-beta4'
//implementation 'com.squareup.okhttp3:logging-interceptor:3.1.2'
implementation 'com.android.volley:volley:1.1.0'
implementation 'com.google.android.gms:play-services-maps:11.8.0'
implementation 'com.google.android.gms:play-services-location:11.8.0'
//implementation 'de.hdodenhof:circleimageview:2.2.0'
// Firebase Module Comfiguration System Library
//implementation 'com.google.firebase:firebase-ads:11.8.0'
implementation 'com.google.firebase:firebase-core:11.8.0'
implementation 'com.google.firebase:firebase-crash:11.8.0'
implementation 'com.google.firebase:firebase-config:11.8.0'
implementation 'com.google.firebase:firebase-invites:11.8.0'
implementation 'com.google.firebase:firebase-database:11.8.0'
// End Firebase Module Configuration System Library
//Membuat Funfgsi Untuk Melakukan Fungsi Tambahan Untuk Module Di dalam system Gradle
implementation 'com.github.nkzawa:socket.io-client:0.3.0'
implementation 'com.google.firebase:firebase-messaging:11.8.0'
implementation 'com.github.halysongoncalves:pugnotification:1.8.1'
//implementation 'com.google.android.gms:play-services-ads:11.8.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
// costum gradle
implementation 'com.android.support:cardview-v7:26.1.0'
implementation 'com.android.support:recyclerview-v7:26.1.0'
implementation 'com.squareup.picasso:picasso:2.5.2'
implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
implementation 'com.afollestad.material-dialogs:commons:0.9.6.0'
//implementation files('libs/mysql-connector-java-5.1.45-bin.jar')
// Glide
implementation 'com.github.bumptech.glide:glide:3.7.0'
//implementation 'com.akexorcist:googledirectionlibrary:1.1.1'
}
尝试构建已签名的apk后，会出现如下错误：
Warning:com.google.android.gms.internal.zzelh: can't find referenced method 'org.json.JSONStringer array()' in program class org.json.JSONStringer
Warning:com.google.android.gms.internal.zzelh: can't find referenced method 'org.json.JSONStringer endArray()' in program class org.json.JSONStringer
Warning:com.google.android.gms.internal.zzelh: can't find referenced method 'org.json.JSONStringer endObject()' in program class org.json.JSONStringer
Warning:com.google.android.gms.internal.zzelh: can't find referenced method 'org.json.JSONStringer key(java.lang.String)' in program class org.json.JSONStringer
Warning:com.google.android.gms.internal.zzelh: can't find referenced method 'org.json.JSONStringer object()' in program class org.json.JSONStringer
Warning:com.google.android.gms.internal.zzelh: can't find referenced method 'org.json.JSONStringer value(java.lang.Object)' in program class org.json.JSONStringer
Warning:there were 6 unresolved references to program class members.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
这是我的Proguard：
# Uncomment this to preserve the line number information for
# debugging stack traces.
#-keepattributes SourceFile,LineNumberTable
# If you keep the line number information, uncomment this to
# hide the original source file name.
#-renamesourcefileattribute SourceFile
-dontwarn com.squareup.okhttp.**
#### -- Picasso --
-dontwarn com.squareup.picasso.**