Latest src fails to compile zepplin-web due to SLF4J missing class???

Right from the mvn build report:
Failed to execute goal com.github.eirslett:frontend-maven-plugin:0.0.20:install-node-and-npm (install node and npm) on project zeppelin-web: Execution install node and npm of goal com.github.eirslett:frontend-maven-plugin:0.0.20:install-node-and-npm failed: A required class was missing while executing com.github.eirslett:frontend-maven-plugin:0.0.20:install-node-and-npm: org/slf4j/helpers/MarkerIgnoringBase

No modifications to the src or to maven...just a git clone and executed maven with the following:
mvn install -DskipTests -Dspark.version=1.2.1 -Dhadoop.version=2.4.0