Gradle failed to load jar library from custom repository

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Below is an extraction of the build.gradle for aTalk running under android studio 3.4. While building,
AS throws the following error.

Any advice on how to resolve the problem is much appreciated.

============= Build error throws by AS ============

FAILURE: Build failed with an exception.

  • What went wrong:
    Execution failed for task ‘:aTalk:preFdroidDebugBuild’.
    >Could not resolve all files for configuration ‘:aTalk:fdroidDebugCompileClasspath’.
    > Could not resolve org.jitsi:ice4j:2.0.0-SNAPSHOT.
    Required by:
    project :aTalk
    Could not resolve org.jitsi:ice4j:2.0.0-SNAPSHOT.
    Unable to load Maven meta-data from https://github.com/jitsi/jitsi-maven-repository/tree/master/snapshots/org/jitsi/ice4j/2.0.0-SNAPSHOT/maven-metadata.xml.
    org.xml.sax.SAXParseException; lineNumber: 44; columnNumber: 89; Attribute name “data-pjax-transient” associated with an element type “meta” must be followed by the ’ = ’ character.

============ aTalk build.gradle ==============

buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath ‘com.android.tools.build:gradle:3.4.0-beta03’
}
}
repositories {
google()
jcenter()
maven {
// Custom libraries repository for org.jitsi
url ‘https://github.com/jitsi/jitsi-maven-repository/tree/master/snapshots’
}
}
dependencies {
implementation (‘org.jitsi:ice4j:2.0.0-SNAPSHOT’) {
transitive = false
}
}