I am installing the 7.3 using "Appian Configuration Manager" and I get

...apache.tools.ant.taskdefs.ExecTask.runExecute(ExecTask.java:635)
          at org.apache.tools.ant.taskdefs.ExecTask.runExec(ExecTask.java:676)
          at org.apache.tools.ant.taskdefs.ExecTask.execute(ExecTask.java:502)
          at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
          at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:601)
          at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
          at org.apache.tools.ant.Task.perform(Task.java:348)
          at org.apache.tools.ant.Target.execute(Target.java:390)
          at org.apache.tools.ant.Target.performTasks(Target.java:411)
          at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1397)
          at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
          at org.apache.tools.ant.Project.executeTargets(Project.java:1249)
          at org...

....apache.tools.ant.taskdefs.Ant.execute(Ant.java:442)
          at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
          at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:601)
          at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
          at org.apache.tools.ant.Task.perform(Task.java:348)
          at org.apache.tools.ant.Target.execute(Target.java:390)
          at org.apache.tools.ant.Target.performTasks(Target.java:411)
          at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1397)
          at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
          at org.apache.tools.ant.Project.executeTargets(Project.java:1249)
          at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:442)
          at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
          at sun.reflect.NativeMeth...

... odAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:601)
          at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
          at org.apache.tools.ant.Task.perform(Task.java:348)
          at org.apache.tools.ant.Target.execute(Target.java:390)
          at org.apache.tools.ant.Target.performTasks(Target.java:411)
          at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1397)
          at org.apache.tools.ant.Project.executeTarget(Project.java:1366)
          at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
          at org.apache.tools.ant.Project.executeTargets(Project.java:1249)
          at org.apache.tools.ant.Main.runBuild(Main.java:801)
          at org.apache.tools.ant.Main.startAnt(Main.java:218)
          at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280...

... )
          at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
Caused by: java.io.IOException: error=13, Permission denied
          at java.lang.UNIXProcess.forkAndExec(Native Method)
          at java.lang.UNIXProcess.<init>(UNIXProcess.java:135)
          at java.lang.ProcessImpl.start(ProcessImpl.java:130)
          at java.lang.ProcessBuilder.start(ProcessBuilder.java:1021)

I know the reason is security for add-user.sh
I tried to chmod 777 and 755 on the JBOSS-ear.zip but I still get the same error message.
Need guidance please

I did the chmod 777 and 755 on Jboss-eap.zip (6.1.0 Final) before running the "ant" command. I even edited the "build.xml" file and added
<exec dir="${appserver.jboss.bin}" executable="add-user.sh" resolveexecutable="true" os="Linux,Solaris,SunOS">
                              <arg line="chmod 755 add-user.sh"/>
           <arg line="-u ${jboss.management.user.username} -p ${jboss.management.user.password} -s"/>
</exec> without success

This is a known problem in the ACM running on Linux, when jboss is unzipped, the permissions on executable files need to updated. Since this is the last step for JBoss install, please follow this doc to create a management user (access.redhat.com/.../eap6-management-users.html
Once you create the user, just execute ACM with a full build (no JBoss install necessary)

thank you very much... It worked