Error at starting httpd after the instillation using spark-ec2 script

Dear All, I installed spark 1.6.1 on Amazon EC2 using spark-ec2 script. Everything was OK, but , it failed to start httpd at the end of the installation. I followed exactly the instruction and I repeated the process many times, but there is no luck. - [timing] rstudio setup: 00h

Error starting Spark 1.6.1

Dear All, I installed spark 1.6.1 on Amazon EC2 using spark-ec2 script. Everything was OK, but , it failed to start httpd at the end of the installation. I followed exactly the instruction and I repeated the process many times, but there is no luck. - [timing] rstudio setup: 00h