Thanks for your swift reply. I used the split option and changed the value until the warnings were gone.
The result: still not very good:
https://imgur.com/4JeCHk1
The meshes of the wires are missing. Also, for some reason I can't open the generator anymore.
The console keeps outputting this error:
NullReferenceException: Object reference not set to an instance of an object
FluffyUnderware.Curvy.Generator.CGGameObjectResourceLoader.Create (FluffyUnderware.Curvy.Generator.CGModule cgModule, System.String context) (at Assets/GeodanGo/3rdParty/Curvy Splines/Curvy/Base/CG/CGResource.cs:239)
FluffyUnderware.Curvy.Generator.CGResourceHandler.CreateResource (FluffyUnderware.Curvy.Generator.CGModule module, System.String resName, System.String context) (at Assets/GeodanGo/3rdParty/Curvy Splines/Curvy/Base/CG/CGResource.cs:49)
FluffyUnderware.Curvy.Generator.CGModule.AddManagedResource (System.String resourceName, System.String context, System.Int32 index) (at Assets/GeodanGo/3rdParty/Curvy Splines/Curvy/Base/CG/CGModule.cs:597)
FluffyUnderware.Curvy.Generator.Modules.CreateGameObject.Refresh () (at Assets/GeodanGo/3rdParty/Curvy Splines/Curvy/Base/CG Modules/CreateGameObject.cs:157)
FluffyUnderware.Curvy.Generator.CGModule.doRefresh () (at Assets/GeodanGo/3rdParty/Curvy Splines/Curvy/Base/CG/CGModule.cs:815)
FluffyUnderware.Curvy.Generator.CurvyGenerator.Refresh (System.Boolean forceUpdate) (at Assets/GeodanGo/3rdParty/Curvy Splines/Curvy/Base/CG/CurvyGenerator.cs:595)
FluffyUnderware.Curvy.Generator.CurvyGenerator.Initialize (System.Boolean force) (at Assets/GeodanGo/3rdParty/Curvy Splines/Curvy/Base/CG/CurvyGenerator.cs:550)
FluffyUnderware.CurvyEditor.Generator.CGGraph.Open (FluffyUnderware.Curvy.Generator.CurvyGenerator generator) (at Assets/GeodanGo/3rdParty/Curvy Splines/Curvy/Base/Editor/CG/CGGraph.cs:141)
FluffyUnderware.CurvyEditor.Generator.CurvyGeneratorEditor.OnInspectorGUI () (at Assets/GeodanGo/3rdParty/Curvy Splines/Curvy/Base/Editor/CG/CurvyGeneratorEditor.cs:45)
UnityEditor.UIElements.InspectorElement+<CreateIMGUIInspectorFromEditor>c__AnonStorey1.<>m__0 () (at C:/buildslave/unity/build/Editor/Mono/Inspector/InspectorElement.cs:445)
UnityEngine.GUIUtility

rocessEvent(Int32, IntPtr)