Expect script error message

[jerry1]

While trying to run an Expect script in a while
loop reading from an input file. I get the
following message on the 49th printer name in
the data list. Does anyone know what this error
message means? I have included the expect script if anyone is interested.

spawn telnet mt1g3l2
parent: sync byte read: bad file number
child: sync byte write: bad file number

[Jeroen Peereboom · Accepted solution]

Without reading the script:
what happens if you sort the printers differently? Still the 49th printer?

JP.

[jerry1]

Never mind. It just came to me that the
system I am trying to run it on still has
a problem with telnet because of nstrpty being set to default 60.
It runs okay on other systems.