Newbie: Needs Help With More Variables

I need to wright more Variables but I have used all the ($0, $1, $2, $3, $4, $5, $6, $7, $8, $9, $R0, $R1, $R2, $R3, $R4, $R5, $R6, $R7, $R8, $R9) Variables but I still need more.

I tryed $V1 in this ReadINIStr but all i got was this error

ReadINIStr $V1 "$PLUGINSDIR\RegistrationDialog.ini" "Field 31" State
StrCmp $R1 "1" yes

THIS ERROR:

Usage: ReadINIStr $(user_var: output) ini_file section entry_name
Error in script "stdin" on line 393 -- aborting creation process

Please Help

Var V1

Outside Sections and Functions and before the code which needs $V1.

Thanks