Hi, here in Cinema 4D S22 defining the type of the cloner I don't have anymore an issue
import c4d from c4d import gui import math def main(): # Build Parent Cloner cloner = c4d.BaseObject(1018544) cloner[c4d.ID_MG_MOTIONGENERATOR_MODE] = c4d.ID_MG_MOTIONGENERATOR_MODE_LINEAR doc.InsertObject(cloner) # Build Null newnull = c4d.BaseObject(c4d.Onull) newnull.InsertUnder(cloner) # Build Children Cloner internal_cloner = c4d.BaseObject(1018544) internal_cloner[c4d.ID_MG_MOTIONGENERATOR_MODE] = c4d.ID_MG_MOTIONGENERATOR_MODE_GRIDARRAY internal_cloner.InsertUnder(newnull) internal_cloner.Message(c4d.MSG_MENUPREPARE, doc) # Cube cube = c4d.BaseObject(c4d.Ocube) internal_cloner.Message(c4d.MSG_MENUPREPARE, doc) cube.InsertUnder(internal_cloner) # Xpresso Tag xtag = c4d.BaseTag(c4d.Texpresso) cloner.InsertTag(xtag) # Setup Parent Cloner cloner[c4d.MG_LINEAR_OBJECT_POSITION, c4d.VECTOR_Y] = 0.0 cloner[c4d.MG_LINEAR_OBJECT_POSITION, c4d.VECTOR_Z] = 500.0 cloner[c4d.MG_LINEAR_COUNT] = 10 cloner[c4d.MGCLONER_VOLUMEINSTANCES_MODE] = c4d.MGCLONER_VOLUMEINSTANCES_MODE_RENDERINSTANCE # Setup Children Cloner internal_cloner[c4d.MG_GRID_SIZE] = c4d.Vector(300, 200, 100) # Setup Cube cube[c4d.PRIM_CUBE_LEN] = c4d.Vector(20, 10, 100) # Setup Xpresso # http://mograph.net/board/index.php?/topic/26338-creating-xpresso-nodes-with-python-script/ nodemaster = xtag.GetNodeMaster() node1 = nodemaster.CreateNode(nodemaster.GetRoot(), c4d.ID_OPERATOR_OBJECT, None, 100, 100) node1[c4d.GV_OBJECT_OBJECT_ID] = internal_cloner gridResParam = c4d.DescID(c4d.DescLevel(c4d.MG_GRID_RESOLUTION, c4d.DTYPE_VECTOR,0), c4d.DescLevel(c4d.VECTOR_Z, c4d.DTYPE_REAL,0)) node1out = node1.AddPort(c4d.GV_PORT_OUTPUT, gridResParam) node2 = nodemaster.CreateNode(nodemaster.GetRoot(), c4d.ID_OPERATOR_OBJECT, None, 300, 100) node2[c4d.GV_OBJECT_OBJECT_ID] = cloner posParam = c4d.DescID(c4d.DescLevel(c4d.MG_LINEAR_OBJECT_POSITION, c4d.DTYPE_VECTOR,0), c4d.DescLevel(c4d.VECTOR_Z, c4d.DTYPE_REAL,0)) node2in = node2.AddPort(c4d.GV_PORT_INPUT, posParam) # Connect if node1out is not None and node2in is not None: node1out.Connect(node2in) c4d.EventAdd() # refreshed viewport to see changes automatically if __name__=='__main__': main()And as pointed by @PluginStudent the problem was because the AddPort fails. And I guess it failed because at the time you ask for the port creation since no explicit mode was defined in the Cloner the XPresso description was not properly fed so this GvPort didn't exist.
Cheers,
Maxime.