Variable outstr is used before it has been assigned a value.A null reference exception could result at runtime

I am trying to migrate my existing 1.1 framework project to 2.0.
and seeing lot of issues.
with variables:
In teh following piece of global function code:
right here at this line:                     StrTok = OutStr
i am getting the following message: "Variable outstr is used before it has been assigned a value.A null reference exception could result at runtime."
 
            If (vCh = Token) And ((inQ = False) _
               Or (skipQ = False)) Then
                If ((i + Len(Token)) <= sLen) Then
                  ...