用C#做二次开发，在创建一个长方体时遇到的问题，急需解决，谢谢

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public void create_block()
    {
        UFModl uf_modl = new UFModl();
        FeatureSigns featureSign;
2 ^# e# ^1 }. e" Q, a        featureSign = FeatureSigns.Nullsign;
        double[] corner_pt = { 0, 0, 0 };
. w' b8 ?7 p. ~) I) C! C        string[] edge_len = { "50", "50", "50" };
; u+ S  d  r9 U: @3 B! X        Tag tag;
( ]6 P: u" X" M' V2 f- j8 L) J        uf_modl.CreateBlock1(featureSign, corner_pt, edge_len, out tag);
    }
0 w$ N, U: c  i' A) `
- H! W# P* l6 y  h6 S5 M在创建UFModl类的实例时，有错误，提示为The type 'NXOpen.UF.UFModl' has no constructors defined