Scene importing failed for filePath DAE

[Jiangpeng123]

SCNScene *scene = [SCNScene sceneNamed:@"art.scnassets/people.DAE"];
self.sceneView.scene = scene;
Its OK
But
SCNAssimpScene *scene = [SCNAssimpScene assimpSceneNamed:@"@"art.scnassets/people.DAE"" postProcessFlags:AssimpKit_Process_FlipUVs| AssimpKit_Process_Triangulate];
Its bad
This problem can occur in any dae file
I'm looking forward to your help very much，thank you