why there is no example for design binder for protein complex

I got error with paras like this, i wonder if it is a incompatible problem that i try to design binder for more than one molecule? ['contigmap.contigs=[C/0 F/0 100-120]', 'ppi.hotspot_res=[C80,C82,C86,C87,C90,C92,C93,E128,C138,C185,C187]', 'denoiser.noise_scale_ca=0', 'denoiser.noise_scale_frame=0'
Traceback (most recent call last):
File "/Share/app/RFdiffusion/scripts/run_inference.py", line 194, in
main()
File "/Share/app/miniconda3.9/envs/SE3nv/lib/python3.9/site-packages/hydra/main.py", line 94, in decorated_main
_run_hydra(
File "/Share/app/miniconda3.9/envs/SE3nv/lib/python3.9/site-packages/hydra/_internal/utils.py", line 394, in _run_hydra
_run_app(
File "/Share/app/miniconda3.9/envs/SE3nv/lib/python3.9/site-packages/hydra/_internal/utils.py", line 457, in _run_app
run_and_report(
File "/Share/app/miniconda3.9/envs/SE3nv/lib/python3.9/site-packages/hydra/_internal/utils.py", line 223, in run_and_report
raise ex
File "/Share/app/miniconda3.9/envs/SE3nv/lib/python3.9/site-packages/hydra/_internal/utils.py", line 220, in run_and_report
return func()
File "/Share/app/miniconda3.9/envs/SE3nv/lib/python3.9/site-packages/hydra/_internal/utils.py", line 458, in
lambda: hydra.run(
File "/Share/app/miniconda3.9/envs/SE3nv/lib/python3.9/site-packages/hydra/_internal/hydra.py", line 132, in run
_ = ret.return_value
File "/Share/app/miniconda3.9/envs/SE3nv/lib/python3.9/site-packages/hydra/core/utils.py", line 260, in return_value
raise self._return_value
File "/Share/app/miniconda3.9/envs/SE3nv/lib/python3.9/site-packages/hydra/core/utils.py", line 186, in run_job
ret.return_value = task_function(task_cfg)
File "/Share/app/RFdiffusion/scripts/run_inference.py", line 84, in main
x_init, seq_init = sampler.sample_init()
File "/Share/app/RFdiffusion/rfdiffusion/inference/model_runners.py", line 278, in sample_init
self.contig_map = self.construct_contig(self.target_feats)
File "/Share/app/RFdiffusion/rfdiffusion/inference/model_runners.py", line 240, in construct_contig
return ContigMap(target_feats, **self.contig_conf)
File "/Share/app/RFdiffusion/rfdiffusion/contigs.py", line 78, in init
) = self.expand_sampled_mask()
File "/Share/app/RFdiffusion/rfdiffusion/contigs.py", line 225, in expand_sampled_mask
int(subcon.split("-")[0][1:]), int(subcon.split("-")[1]) + 1
ValueError: invalid literal for int() with base 10: ''

Reproduce the command and traceback through scripts/run_inference.py, then inspect rfdiffusion/inference/model_runners.py and rfdiffusion/contigs.py, especially expand_sampled_mask. Determine whether the shown multi-chain contig syntax is supported and identify the expected behavior or an actionable error message. Done means the supported input is clear and the reported failure is resolved or documented.