Issue with using gvim system() and fzy

Hi experts

Having an issue while doing a system() call with fzy(https://github.com/Dkendal/fzy-vim)from inside gvim

Code snippet

silent let output = system("ag -l -g '' --nocolor | fzy")

Decho(1)
Decho (output)
Decho(2)
Decho(3)


The output is

1
Failed to open /dev/tty^J
2
3


If i remove fzy from the command the result is fine. Can someone please help me debugging the issue?

Thanks in advance.

System information:

Red Hat Enterprise Linux Client 6 U7
Linux ltipc897 2.6.32-573.el6.x86_64 #1 SMP Wed Jul 1 18:23:37 EDT 2015 x86_64 GNU/Linux

Vim Version: 8.0.143



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