Substance - How do you set the random seed of procedural material at runtime

Trying to set procedural material at runtime using:

        ProceduralMaterial matshooterbase = Instantiate(matLazerShooterBase) as ProceduralMaterial;
        if (matshooterbase) {
            matshooterbase.SetProceduralFloat ("RandomSeed", UnityEngine.Random.Range (0, 9999));
            matshooterbase.RebuildTextures ();
            golazerbase.transform.Find ("BASE").GetComponent ().sharedMaterial = matshooterbase;
            el.matLazerShooterBase = matshooterbase;
        }

But with getting this error:

material->IsFlagEnabled (ProceduralMaterial::Flag_Clone) || m_PingedMaterial == NULL || m_PingedMaterial == material
UnityEngine.Object:Instantiate(ProceduralMaterial)

(Unity 5.2.0f3)