Error Codes
Reference for Dr.Q solver error codes and what to do about them.
E1001 — Singular stiffness matrix
What it means: The model has rigid body movement — at least one part can move freely without being constrained.
Fix: Check boundary conditions. Every part must be constrained in all six degrees of freedom (three translations, three rotations). Add the missing support.
E1002 — Convergence not achieved
What it means: The nonlinear solver failed to converge within the maximum number of iterations.
Fix: Reduce load step size, refine the mesh in problem areas, and review contact settings. See Troubleshooting → Convergence Errors for a full diagnostic approach.
E1003 — Invalid material
What it means: Material values are physically unrealistic.
Fix: Check Young's modulus and Poisson's ratio. Poisson's ratio must be between 0 and 0.5. Young's modulus must be positive and in the correct unit (MPa, not GPa).