message: initialize gf
diff: @@ -335,7 +335,7 @@ protected:
  Array<int> mesh_refinements;
  Vector element_oscs;
  Coefficient *coeff = NULL;
  - GridFunction *gf;
  + GridFunction *gf = NULL;
  const IntegrationRule *ir_default[Geometry::NumGeom];
  const IntegrationRule **irs = NULL;
  