An array's dimention must be an integer between 1 and 1000

I have the following array routine within my crystal reports formula field:

dim aryInfo() as string
dim aryField() as string
dim sField as string
dim n as number

dim iPos as number 

aryinfo = split({Command.Info},">")

formula = ""
for n = 1 to count(aryinfo)
    sfield = aryinfo(n)
    iPos =  instr(sfield,"</LastName") 
    if iPos > 0 then
        formula = left(sfield,ipos-1)
    end if
    iPos = instr(sfield,"</FirstName")
    if iPos > 0 then
        formula = LEFT(sfield,ipos-1) & " " &  formula
        exit for
    end if
next

When I run the crystal report, I got erro message "An array's dimention must be an integer between 1 and 1000.

The error is pointing to

aryinfo = split({Command.Info},">")

It is my first time using this method within my formula field.  Not certain how to go about fixing this error.

Please help!