Spark-shell prompt not getting, no error

I am login to lab by putty. in spark I am not getting the prompt.
Linux gw01.itversity.com 3.14.32-xxxx-grs-ipv6-64 #9 SMP Thu Oct 20 14:53:52 CEST 2016 x86_64 x86_64 x86_64 GNU/Linux

server : 266639
hostname : gw01.itversity.com
eth0 IPv4 : 149.56.24.210
eth0 IPv6 : 2607:5300:61:9d2::/64

[justycx201703@gw01 ~]$ spark-shell
Multiple versions of Spark are installed but SPARK_MAJOR_VERSION is not set
Spark1 will be picked by default
Welcome to
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/ / ___ / /
\ / _ / _ `/ __/ '/
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/ .__/_,// //_\ version 1.6.2
/
/

Using Scala version 2.10.5 (Java HotSpotâ„¢ 64-Bit Server VM, Java 1.8.0_77)
Type in expressions to have them evaluated.
Type :help for more information.
Spark context available as sc.
SQL context available as sqlContext.