dr.elephant wont start

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ran the below...
export ACTIVATOR_HOME=/tmp/elephant/activator-dist-1.3.12
export PATH=$ACTIVATOR_HOME/bin:$PATH
export HADOOP_HOME=/opt/cloudera/parcels/CDH/lib/hadoop
export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop
export SPARK_HOME=/opt/cloudera/parcels/CDH/lib/spark
export SPARK_CONF_DIR=/opt/cloudera/parcels/CDH/lib/spark/conf
sh bin/start.sh app-conf/
then got the below error in dr.log
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
Play server process ID is 10369
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/tmp/elephant/dr-elephant/dist/dr-elephant-2.1.7/lib/ch.qos.logback.logback-classic-1.0.13.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/tmp/elephant/dr-elephant/dist/dr-elephant-2.1.7/lib/org.slf4j.slf4j-simple-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/tmp/elephant/dr-elephant/dist/dr-elephant-2.1.7/lib/org.slf4j.slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/cloudera/parcels/CDH-5.13.1-1.cdh5.13.1.p0.2/jars/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
[info] play - database [default] connected at jdbc:mysql://drelephant.cruair45pm4u.us-east-1.rds.amazonaws.com/drelephant?characterEncoding=UTF-8
[info] application - Starting Application...
Exception in thread "main" java.lang.ExceptionInInitializerError
at Global.onStart(Global.java:41)
at play.core.j.JavaGlobalSettingsAdapter.onStart(JavaGlobalSettingsAdapter.scala:18)
at play.api.GlobalPlugin.onStart(GlobalSettings.scala:203)
at play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:88)
at play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:88)
at scala.collection.immutable.List.foreach(List.scala:318)
at play.api.Play$$anonfun$start$1.apply$mcV$sp(Play.scala:88)
at play.api.Play$$anonfun$start$1.apply(Play.scala:88)
at play.api.Play$$anonfun$start$1.apply(Play.scala:88)
at play.utils.Threads$.withContextClassLoader(Threads.scala:18)
at play.api.Play$.start(Play.scala:87)
at play.core.StaticApplication.(ApplicationProvider.scala:52)
at play.core.server.NettyServer$.createServer(NettyServer.scala:243)
at play.core.server.NettyServer$$anonfun$main$3.apply(NettyServer.scala:279)
at play.core.server.NettyServer$$anonfun$main$3.apply(NettyServer.scala:274)
at scala.Option.map(Option.scala:145)
at play.core.server.NettyServer$.main(NettyServer.scala:274)
at play.core.server.NettyServer.main(NettyServer.scala)
Caused by: java.lang.RuntimeException: Could not invoke class com.linkedin.drelephant.tez.fetchers.TezFetcher
at com.linkedin.drelephant.ElephantContext.loadFetchers(ElephantContext.java:190)
at com.linkedin.drelephant.ElephantContext.loadConfiguration(ElephantContext.java:111)
at com.linkedin.drelephant.ElephantContext.(ElephantContext.java:102)
at com.linkedin.drelephant.ElephantContext.instance(ElephantContext.java:95)
at com.linkedin.drelephant.DrElephant.(DrElephant.java:43)
at com.linkedin.drelephant.DrElephant.(DrElephant.java:33)
... 18 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.linkedin.drelephant.ElephantContext.loadFetchers(ElephantContext.java:169)
... 23 more
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:204)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
at sun.net.www.http.HttpClient.(HttpClient.java:242)
at sun.net.www.http.HttpClient.New(HttpClient.java:339)
at sun.net.www.http.HttpClient.New(HttpClient.java:357)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
at com.linkedin.drelephant.tez.fetchers.TezFetcher$URLFactory.verifyURL(TezFetcher.java:156)
at com.linkedin.drelephant.tez.fetchers.TezFetcher$URLFactory.(TezFetcher.java:150)
at com.linkedin.drelephant.tez.fetchers.TezFetcher$URLFactory.(TezFetcher.java:144)
at com.linkedin.drelephant.tez.fetchers.TezFetcher.(TezFetcher.java:59)
... 28 more

Start by reproducing the `sh bin/start.sh app-conf/` command and read the stack trace from `Global.java`, `ElephantContext.java`, and `TezFetcher.java`, especially the URL verification path. Check the configured Tez endpoint and its reachability; done means Dr. Elephant starts without the `TezFetcher` initialization failure.

Written by the indexing model from the issue text.