F5 iApp Automated Backup

Perhaps I'm missing something from the instruction. But I downloaded the above code into notepad++, saved and uploaded to the BIG-IP. Local backups work fine but as soon as I'm trying to send it to a remote storage location I'm hit with this error:

script did not successfully complete: (couldn't create pipe: too many open files
while executing
"exec echo "$::destination_parameters__ftp_remote_username" | openssl aes-256-ecb -salt -a -A -k ${f5masterkey}"
invoked from within
"if { $freq != "Disable" } {
 Ensure a default $filename_format is set
if { $::destination_parameters__filenam..." line:48)

I can see there are some script files in the github repository but the instruction (if I haven't missed anything) does not imply where these should be installed if they need to be. Tried altering the schedule, the encryption setting etc.

Anyone got an idea what I need to do?