'unable to build apk getting unable to load maven meta-data error from http://pay.cards/maven

i am facing this error while building apk Caused by: org.gradle.api.resources.ResourceException: Unable to load Maven meta-data from http://pay.cards/maven/com/facebook/android/facebook-android-sdk/maven-metadata.xml. this is my gradle file

repositories {

maven {

    url 'https://maven.fabric.io/public'



}

}

android

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