Why do I get Run-time error '449': Argument no optional?

When I run the program, I get the abovementioned error. Is it possible that it's caused by how I declare word1 and word2? Thanks.  Where command and argPassedIn are extracted
Function CommandCode(PC As Long)
    Dim command As String
    Dim argPassedIn As String
  
    command = Worksheets("GUI").Cells(PC + 1, 2).Value
    argPassedIn = Worksheets("GUI").Cells(PC + 1, 3).Value

    If InStr(argPassedIn, ",") = False Then CallByName Me, command, VbMethod, argPassedIn
    
    If InStr(argPassedIn, ",") Then CallByName Me, command, VbMethod, Split(argPassedIn, ",")
      
End Function

Function MySend(ByVal data As String)
    If LCase(data) = "chr(13)" Then data = Chr(13)
    If LCase(data) = "chr(27)" Then data = Chr(27)
    wsTCP.SendData data
End Function

Function CheckWarning(word1 As String, word2 As String)
'Detect whether there is a warning. If there is, keep sending word2.

    Do While (InStr(sBuffer, word1) > 0)   'Gets out of loop when word1 no longer exists
        sBuffer = ""
        MySend word2
        Call CheckBuffer
    Loop
    
End Function

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teelingAsked:
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Om PrakashCommented:
The error means that you are calling a Sub or Function but not specified enough parameters.
More info:
http://www.vbforums.com/showthread.php?t=451560#notoptional
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teelingAuthor Commented:
Split(argPassedIn, ",") actually splits the WARNING: Unable to issue or receive for item,Chr(32) into arrays where the first array contains  WARNING: Unable to issue or receive for item and the second array contains Chr(32).

Function CheckWarning(word1 As String, word2 As String) needs 2 arguments. I send the arrays into CheckWarning. Will this not work?

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teelingAuthor Commented:
I've got it working :)

Function CheckWarning(ByRef myarray As Variant)

    Do While (InStr(sBuffer, myarray(0)) > 0)   'Gets out of loop when word1 no longer exists
        sBuffer = ""
        MySend myarray(1)
        Call CheckBuffer
    Loop
    
End Function

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Visual Basic Classic

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