With c# or a batch file I mount a trueCrypt volume located at A:\volumeTrueCrypt.tc

With c# I do:

static void Main(string[] args)
{
    var p = Process.Start(
         fileName:@"C:\Program Files\TrueCrypt\TrueCrypt.exe",
         arguments:@"/v a:\volumetruecrypt.tc /lw /a /p truecrypt"
    );
    p.WaitForExit();
}

the alternative is to run the command on the command line as:

C:\Windows\system32>"C:\Program Files\TrueCrypt\TrueCrypt.exe" /v "a:\volumetruecrypt.tc" /lw /a /p truecrypt

Either way I get the error:

Why do I get that error? I was able to run that command the first time. The moment I dismounted the volume and tryied to mount it again I got that error. I know that drive letter W is available because it shows as an available letter on true crypt if I where to open it manually:

If I where then click on the button mount and then type the password truecrypt (truecrypt is the password) then it will successfully mount on drive w. Why I am not able to mount it from the command line!? If I change the drive letter on the command line it works. I want to use the drive W though. In other words executing

 "C:\Program Files\TrueCrypt\TrueCrypt.exe" /v "a:\volumetruecrypt.tc" /lz /a /p truecrypt

will successfully mount that volume on drive z but I do not want to mount it on drive z I want to mount it on drive w. The first time I ran the batch it ran fine. Also if I restart my computer I believe it should work. More info on how to use trueCrypt through the command line can be found at: http://www.truecrypt.org/docs/?s=command-line-usage

Edit

I was also investivating when does this error occures. In order to generate this error you need to follow this steps.

1) execute the command: (note the /q argument at the end for quiet)

 "C:\Program Files\TrueCrypt\TrueCrypt.exe" /v "a:\volumetruecrypt.tc" /ln /a /p truecrypt /q

  "C...TrueCrypt.exe"  = location where trueCrypt is located
  /v "path"            = location where volume is located
  /n                   = drive letter n
  /p truecrypt         = password is "trueCrypt"
  /q                   = execute in quiet mode. do not show window

note I am mounting to drive letter n

2) now volume should be mounted.

3) Open trueCrypt and manually dismount that volume (without using command line)

4) Attempt to run the same command line (without the /q so you see the error)

"C:\Program Files\TrueCrypt\TrueCrypt.exe" /v "a:\volumetruecrypt.tc" /ln /a /p truecrypt

5) an error should show up

So the problem ocures when I manually dismount the volume. If I dismount it from the command line I get no errors. But I think this is a bug from trueCrypt