Hi+welcome :!:
FSAcars causes a lot of problems, most rather use
. Maybe you could try that. Download the needed files in your
and follow the enclosed readme.
I use XAcars, so I can only tell you how that works:
After installing and dropping in the VA specific config files you can start a flight-plan here, then start XAcars, fill out the flight number(ACHxxxx) and press <Get ACARS flightdata>, it then automagically downloads your flight-plan.
With the engines off and the parking brake on you can press <START ACARS>. After landing you can
stop your engines and apply the parking brake at the gate and then upload your flight under <View Pirep>.
[imgpop]http://uppix.net/3HunlS.png[/imgpop]
Please tell us if that worked.