This error message is usually issued during Euler/Lagrange coupling calculations when a Lagrange element is distorted and degenerated to the extent that it interferes with the coupling. You may need to set Lagrange/Lagrange interaction before starting Euler/Lagrange coupling calculations even if there is only one Lagrange part in your model or when there is no contact between two Lagrange. Activation of Lagrange/Lagrange Interaction -> Self-impact for Lagrange parts can prevent Lagrange parts from penetrating into themselves during the solution and causing the Euler/Lagrange coupling error. We usually recommend activating Lagrange/Lagrange interaction when Euler/Lagrange coupling is used, especially if the Lagrange parts will fail, erode, or experience large deformation.