[Bug] AttributeError: module 'modules.sd_models' has no attribute 'read_state_dict'

[Eugeoter]

When I click "Run Merge", the console reports an error. The following is the error message:

#### Merge Block Weighted ####
  model_0    : animeR8_120000_0.7-animeR_41800_0.7-a3_0.3-Weighted_sum-merged_0.3-Weighted_sum-merged.ckpt [687d631c]
  model_1    : animeR_41800_0.7-a3_0.3-Weighted_sum-merged.ckpt [f93f294e]
  base_alpha : 0
  output_file: /root/autodl-tmp/stable-diffusion-webui/models/Stable-diffusion/b1-half.ckpt
  weights    : 1,1,1,1,1,1,1,1,1,1,1,1,1,0.25,0.25,0.25,0.25,0.25,0.25,0.5,0.5,0.5,0.5,0.5,0.5
  skip ids   : 2 : 0:None, 1:Skip, 2:Reset
loading animeR8_120000_0.7-animeR_41800_0.7-a3_0.3-Weighted_sum-merged_0.3-Weighted_sum-merged.ckpt [687d631c]
Traceback (most recent call last):
  File "/root/miniconda3/lib/python3.8/site-packages/gradio/routes.py", line 284, in run_predict
    output = await app.blocks.process_api(
  File "/root/miniconda3/lib/python3.8/site-packages/gradio/blocks.py", line 982, in process_api
    result = await self.call_function(fn_index, inputs, iterator)
  File "/root/miniconda3/lib/python3.8/site-packages/gradio/blocks.py", line 824, in call_function
    prediction = await anyio.to_thread.run_sync(
  File "/root/miniconda3/lib/python3.8/site-packages/anyio/to_thread.py", line 31, in run_sync
    return await get_asynclib().run_sync_in_worker_thread(
  File "/root/miniconda3/lib/python3.8/site-packages/anyio/_backends/_asyncio.py", line 937, in run_sync_in_worker_thread
    return await future
  File "/root/miniconda3/lib/python3.8/site-packages/anyio/_backends/_asyncio.py", line 867, in run
    result = context.run(func, *args)
  File "/root/autodl-tmp/stable-diffusion-webui/extensions/sdweb-merge-block-weighted-gui-master/scripts/mbw/ui_mbw.py", line 172, in onclick_btn_do_merge_block_weighted
    result, ret_message = merge(weights=_weights, model_0=model_A, model_1=model_B, allow_overwrite=chk_allow_overwrite,
  File "/root/autodl-tmp/stable-diffusion-webui/extensions/sdweb-merge-block-weighted-gui-master/scripts/mbw/merge_block_weighted.py", line 54, in merge
    theta_0 = load_model(model_0, device)
  File "/root/autodl-tmp/stable-diffusion-webui/extensions/sdweb-merge-block-weighted-gui-master/scripts/mbw/merge_block_weighted.py", line 51, in load_model
    return sd_models.read_state_dict(model_file, map_location=_device)
AttributeError: module 'modules.sd_models' has no attribute 'read_state_dict'

I don't know how to fix it. I shell be most grateful if you can help me.