I have installed gazebo citadel and launched ign gazebo then I am getting following error

x-gnu/ld-2.27.so 7ff8e0085000-7ff8e0086000 rw-p 00028000 08:01 661101 /lib/x86_64-linux-gnu/ld-2.27.so 7ff8e0086000-7ff8e0087000 rw-p 00000000 00:00 0 7ffe7ab6b000-7ffe7b36a000 rw-p 00000000 00:00 0 [stack] 7ffe7b3f5000-7ffe7b3f8000 r--p 00000000 00:00 0 [vvar] 7ffe7b3f8000-7ffe7b3f9000 r-xp 00000000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0 [vsyscall]

[NOTE] You may have encountered a bug in the Ruby interpreter or extension libraries. Bug reports are welcome. For details: http://www.ruby-lang.org/bugreport.html