8.6.0 diffusion demo txt2img not working

Description

I try to run by instructions
and on step
python3 demo_txt2img.py "a beautiful photograph of Mt. Fuji during cherry blossom" --hf-token=$HF_TOKEN -v
I encounter the error

[E] ModelImporter.cpp:726: While parsing node number 7 [LayerNormalization -> "/text_model/encoder/layers.0/layer_norm1/LayerNormalization_output_0"]:                    
[E] ModelImporter.cpp:727: --- Begin node ---                                                                                                                             
[E] ModelImporter.cpp:728: input: "/text_model/embeddings/Add_output_0"                                                                                                   
    input: "text_model.encoder.layers.0.layer_norm1.weight"                                                                                                               
    input: "text_model.encoder.layers.0.layer_norm1.bias"                                                                                                                 
    output: "/text_model/encoder/layers.0/layer_norm1/LayerNormalization_output_0"                                                                                        
    name: "/text_model/encoder/layers.0/layer_norm1/LayerNormalization"                                                                                                   
    op_type: "LayerNormalization"                                                                                                                                         
    attribute {                                                                                                                                                           
      name: "axis"                                                                                                                                                        
      i: -1                                                                                                                                                               
      type: INT                                                                                                                                                           
    }                                                                                                                                                                     
    attribute {                                                                                                                                                           
      name: "epsilon"                                                                                                                                                     
      f: 1e-05                                                                                                                                                            
      type: FLOAT                                                                                                                                                         
    }                                                                                                                                                                     
[E] ModelImporter.cpp:729: --- End node ---                                                                                                                               
[E] ModelImporter.cpp:732: ERROR: builtin_op_importers.cpp:5428 In function importFallbackPluginImporter:                                                                 
    [8] Assertion failed: creator && "Plugin not found, are the plugin name, version, and namespace correct?"                                                             
[E] In node 7 (importFallbackPluginImporter): UNSUPPORTED_NODE: Assertion failed: creator && "Plugin not found, are the plugin name, version, and namespace correct?"     
[!] Could not parse ONNX correctly
[0] 0:[tmux]*                                                                                                                      "root@5100eb7a428b: /w" 16:17 17-Mar-23

Environment

TensorRT Version:
NVIDIA GPU:
NVIDIA Driver Version:
CUDA Version:
CUDNN Version:
Operating System:
Python Version (if applicable):
Tensorflow Version (if applicable):
PyTorch Version (if applicable):
Baremetal or Container (if so, version):

Relevant Files

Steps To Reproduce

Start with demo_txt2img.py and reproduce the documented command, then inspect the ModelImporter error for the LayerNormalization node. Collect the missing TensorRT, GPU, driver, CUDA, cuDNN, OS, Python, and container details and compare the failing ONNX import with the expected demo setup. Done means the cause is identified and the diffusion demo runs successfully, or the issue is narrowed to a reproducible importer failure.