大佬救命！！！修改材质贴图的问题

Creator 3.x
#1

this.normalMap = m.getProperty(“normalMap”) as Texture2D;
this.metallicRoughnessMap = m.getProperty(“metallicRoughnessMap”) as Texture2D;
this.emissiveMap = m.getProperty(“emissiveMap”) as Texture2D;

let m2 = new Material();

        // 初始化
        m2.initialize({
            effectName: "builtin-standard",
            defines: {
                USE_ALBEDO_MAP: true,
                USE_NORMAL_MAP: true,
                USE_METALLIC_ROUGHNESS_MAP: true,
                USE_EMISSIVE_MAP: true,
            }
        })

        // 复制
        m.copy(m2);

        m2.setProperty("albedoMap", this.albedoMap);
        m2.setProperty("normalMap", this.normalMap);
        m2.setProperty("metallicRoughnessMap", this.metallicRoughnessMap);
        m2.setProperty("emissiveMap", this.emissiveMap);

这是我从m材质复制到m2的逻辑代码，现在m2.setProperty(“metallicRoughnessMap”, this.metallicRoughnessMap);这一行报错，说没有"metallicRoughnessMap"这个属性，有人知道为什么吗