这段代码为什么报这段错误,求指导
Imports DataMatrix.net
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim options As New DmtxImageEncoderOptions()
options.ModuleSize = 5
options.SizeIdx = DmtxSymbolSize.DmtxSymbol12x12
' 创建DataMatrix类的实例,将DmtxImageEncoderOptions对象作为参数传递
Dim dm As New DataMatrix()
End Sub
End Class