---
**[tickets:#19] model free analysis is not working with the error**
**Status:** open
**Created:** Tue Nov 11, 2025 06:00 PM UTC by Seungwoo Lee
**Last Updated:** Tue Nov 11, 2025 06:00 PM UTC
**Owner:** nobody
I tried to run the model-free analysis in RELAX-NMR, but I received an error
message immediately after execution. The same error occurs even when using a
dataset that previously ran without any issues in version 5.0.0.
Traceback (most recent call last):
File "/usr/software/relax/source/gui/analyses/execute.py", line 87, in run
self.run_analysis()
File "/usr/software/relax/source/gui/analyses/auto_model_free.py", line 838,
in run_analysis
dauvergne_protocol.dAuvergne_protocol(pipe_name=self.data.pipe_name,
pipe_bundle=self.data.pipe_bundle, results_dir=self.data.save_dir,
diff_model=self.data.global_models, mf_models=self.data.mf_models,
local_tm_models=self.data.local_tm_models, grid_inc=self.data.inc,
diff_tensor_grid_inc=self.data.diff_tensor_grid_inc,
mc_sim_num=self.data.mc_sim_num, max_iter=self.data.max_iter,
conv_loop=self.data.conv_loop)
File "/usr/software/relax/source/auto_analyses/dauvergne_protocol.py", line
249, in __init__
self.execute()
File "/usr/software/relax/source/auto_analyses/dauvergne_protocol.py", line
607, in execute
self.multi_model(local_tm=True)
File "/usr/software/relax/source/auto_analyses/dauvergne_protocol.py", line
895, in multi_model
self.interpreter.minimise.grid_search(inc=self.grid_inc)
File "/usr/software/relax/source/prompt/uf_objects.py", line 161, in __call__
self._backend(*new_args, **uf_kargs)
File "/usr/software/relax/source/pipe_control/minimise.py", line 173, in
grid_search
model_lower, model_upper, model_inc = grid_setup(lower, upper, inc,
verbosity=verbosity, skip_preset=skip_preset)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/software/relax/source/pipe_control/minimise.py", line 342, in
grid_setup
elif values[i] in [None, {}, []]:
^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: The truth value of an empty array is ambiguous. Use `array.size >
0` to check that an array is not empty.
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