The problem is that I have no code.

But in the OP you said:

I have a Perl program on my local machine and it always shows the error

If you're asking for help on that problem, then you'll need to show code that reproduces the problem, the exact error message, etc.

If you're instead asking a conceptual question, you'll need to provide more details. What OS exactly, what this "queue" is, what you want to accomplish, etc.

$exe_dir=\\\\nyadpfi\\pfi\\report (which is UNC path format)

my $executable_1  = $exe_dir."\\Compute5.exe";
my $executable_2  = $exe_dir."\\Engine.exe";
my $executable_3  = $exe_dir."\\Engtoacc.exe";
my $executable_4  = $exe_dir."\\Listvj.exe";
[download]

Then we run it:

Running IJ 4 of 4:\\nyadpfi\pfi\report\Listvj.exe \\nyadpfi\pfidata\IJ
+.682.ICEI.
94zfvVoehcqG8.NY10T44.20160609.prm -i:\\nyadpfi\pfi\core\pam_unc.ini
[download]

\\nynas1\nynds4\vol2\DATA\INVACCT\Fund_Recs_PFI' is output dir. and the error message is:

'\\nynas1\nynds4\vol2\DATA\INVACCT\Fund_Recs_PFI'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported.  Defaulting to Windows directory.
The syntax of the command is incorrect.
[download]

I think we have to make if as:

G:\\INVACCT\\Fund_Recs_PFI'

Please advise

Thanks,

Oleg