Invalid argument was enountered

[jxm28788]

I see the network settings haven't improved one bit since v7, it's still a PITA to set up.

My host is 'host-it' (ex pinbrook) and I used the v10 network settings from their knowledgebase as a starting point and imported them. But when I try to 'test' the settings it gets as far as

Testing Normal Settings...
Testing CGI Script Settings...

Then it comes up with the totally unhelpful error "An invalid argument was encountered" (why do these stupid messages never say what the invalid argument was? Then at least it might give a clue to what was wrong)

Here is the censored net settings export, can anyone spot the error?

HTTPPROXYMODE 0
HTTPPROXYADDRESS
HTTPPROXYPORT 80
HTTPPROXYUSER
HTTPPROXYPASSWORD
FTPPROXYMODE 0
FTPPROXYADDRESS
FTPPROXYPORT 21
FTPPROXYUSER
FTPPROXYPASSWORD
SCRIPTID 1
SCRIPTEXT .pl
SMTPHOST mail5.srv.host-it.co.uk
WEBSITEURL http://www.[mydomain].com/
IGNOREPASSIVEERRORS true
USERELATIVECGIURLS false
PATHTOPERL /usr/bin/perl
USEENHANCEFTP true
FTPCLIENTTIMEOUT 55000
FTPRETRYDELAY 3000
FTPKEEPALIVEINTERVAL 30000
FTPSILENT false
FTPMAXRETRIES 3
FTPCONNECTTIMEOUT 60000
SMTPAUTHREQUIRED false
SMTPUSERNAME
SMTPPASSWORD
COMPRESSIONPACKETSIZE 1024
COMPRESSEDUPLOAD true
CATALOGURL http://www.[mydomain].com/acatalog/
ONLINESTOREFOLDERNAME acatalog
CGIBINURL http://www.[mydomain].com/cgi-bin/
PATHFROMCGITOCATALOG ../httpdocs/acatalog/
FTPHOST ftp.[mydomain].com
FTPUSERNAME [myusername]
FTPPASSWORD [mypassword]
PATHTOCGIBIN /cgi-bin/
USEPASSIVEFTP true
FTPPATHFROMCGITOCATALOG /httpdocs/acatalog/

I did try the Wizard, but it kept failing on the perl path (even though it appears to be correct), and also manually but that didn't work either...