Scripting Error but script still works

Question

I've got a form that has two fields in which I've used concatenation to put two names together ("John Doe and Jane Doe"). These names are imported as xdp named '_UnparsedName' under a repeated container 'sfBorrower'. Based on my understanding of how these kinds of iterations get named and called, I've written the script to call sfBorrower[0]._UnparsedName and sfBorrower[1]._UnparsedName.
I'm using FormCalc to do this as I couldn't get JavaScript to do any kind of concatenation that worked.
The problem I've got is that everytime I open the pdf version of the form I get the following error
Script failed (language is formcalc; context is xfa[0].form[0].DOCUMENT[0].P1[0].sfParties[0].sfNames[0].Borrowers[0])
script = Concat(P1.sfParties.sfBorrower[0]._UnparsedName.rawValue, " and ", P1.sfParties.sfBorrower[1]._UnparsedName.rawValue)
Error: accessor "P1.sfParties.sfGrantor[1]._UnparsedName.rawValue' is unknown
The strange thing is that when I go ahead and click through the error and let the form open, the script works fine.
I'm a little hesitant to distribute a form that throws up errors even if the form itself seems to work okay.
I'd appreciate any insight anyone's got on this -even if it's just to tell me I need to go read up on formCalc again!
Thanks

Answer 1

I checked "Require password to unlock each secure system preference." I still receive the "Authentication Error." It doesn't seem like a machine-specific problem. I'm wondering if it's a modem issue.
For what it's worth, when I run KeyChain First Aid, here the line that comes up red:
"incoming.verizon.net" has unspecified value for port attribute
KeyChain makes the repair but it only holds for a few hours. When I run First Aid again, I get the same message.
It's a very frustrating problem because I'm able to receive (and send) my emails. But that dreaded "Mail could not be received at this time" dialogue box keeps popping up prompting me to re-enter my password. Ugh!