Error (0x800A000D)

I did a page with some event with insert asp code snipped from your software AspRunnerPro, but some event have problems, the page say:
Tipo de error:

Error de Microsoft VBScript en tiempo de ejecución (0x800A000D)

No coinciden los tipos: 'ttype'

/project1/include/commonfunctions.asp, línea 1303
The code in the line 1303 is:
Function IsNumberType(ttype)

If ttype = 20 Or ttype = 6 Or ttype = 14 Or ttype = 5 Or ttype = 10

Or ttype = 3 Or ttype = 131 Or ttype = 4 Or ttype = 2 Or ttype = 16

Or ttype = 21 Or ttype = 19 Or ttype = 18 Or ttype = 17 Or ttype = 139 or ttype = 11

or ttype = 9 or ttype = 12 or ttype = 13 or ttype = 14 or ttype = 15 or ttype = 16

or ttype = 17 Then
Could you please tell me, what is bad ?
Thanks.