# Bug encountered when computing LCMV spatial filter with a Label **URL:** \ **Category:** Support & Discussions\ **Tags:** source-localization\ **Created:** [May 25, 2023, 5:03pm UTC](https://mne.discourse.group/t/bug-encountered-when-computing-lcmv-spatial-filter-with-a-label/6965 "2023-05-25T17:03:25Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![georgekenefati](https://avatars.discourse-cdn.com/v4/letter/g/34f0e0/32.png) [@georgekenefati](https://mne.discourse.group/u/georgekenefati)\ **Post date:** [May 25, 2023, 5:03pm UTC](https://mne.discourse.group/t/bug-encountered-when-computing-lcmv-spatial-filter-with-a-label/6965/1 "2023-05-25T17:03:25Z")
mne.beamformer.make\_lcmv works without any label chosen but crashes when a Label instance is chosen with the label= argument. Please help! Thank you 🙂 **OS details:** - MNE version: 1.3.0 - operating system: Ubuntu 20.04 **Code snippet:** ```python one_label = mne.read_labels_from_annot(subject, regexp='rostralanteriorcingulate-lh', subjects_dir=subjects_dir)[0] one_label # LCMV filters_tmp = make_lcmv( info=raw.info, forward=fwd_vol, data_cov=data_cov, reg=0.05, noise_cov=noise_cov, label=one_label, pick_ori="max-power", weight_norm="unit-noise-gain", rank=None, ) # You can save the filter for later use with: # filters.save('filters-lcmv.h5') stc_LCMV_tmp = apply_lcmv_raw(raw, filters_tmp) stc_LCMV_tmp.save(save_dir+sub_dir_name+f"{selected_labels[i].name[:-3]}_LCMV",overwrite=True) --------------------------------------------------------------------------- TypeError Traceback (most recent call last) Cell In[17], line 5 2 one_label 4 # LCMV ----> 5 filters_tmp = make_lcmv( 6 info=raw.info, 7 forward=fwd_vol, 8 data_cov=data_cov, 9 reg=0.05, 10 noise_cov=noise_cov, 11 label=one_label, 12 pick_ori="max-power", 13 weight_norm="unit-noise-gain", 14 rank=None, 15 ) 16 # You can save the filter for later use with: 17 # filters.save('filters-lcmv.h5') 18 stc_LCMV_tmp = apply_lcmv_raw(raw, filters_tmp) File :12, in make_lcmv(info, forward, data_cov, reg, noise_cov, label, pick_ori, rank, weight_norm, reduce_rank, depth, inversion, verbose) File ~/anaconda3/envs/eegenv/lib/python3.9/site-packages/mne/beamformer/_lcmv.py:162, in make_lcmv(info, forward, data_cov, reg, noise_cov, label, pick_ori, rank, weight_norm, reduce_rank, depth, inversion, verbose) 158 if inversion == 'single': 159 depth['combine_xyz'] = False 161 is_free_ori, info, proj, vertno, G, whitener, nn, orient_std = \ --> 162 _prepare_beamformer_input( 163 info, forward, label, pick_ori, noise_cov=noise_cov, rank=rank, 164 pca=False, **depth) 165 ch_names = list(info['ch_names']) 167 data_cov = pick_channels_cov(data_cov, include=ch_names) File ~/anaconda3/envs/eegenv/lib/python3.9/site-packages/mne/beamformer/_compute_beamformer.py:54, in _prepare_beamformer_input(info, forward, label, pick_ori, noise_cov, rank, pca, loose, combine_xyz, exp, limit, allow_fixed_depth, limit_depth_chs) 52 # Restrict forward solution to selected vertices 53 if label is not None: ---> 54 _, src_sel = label_src_vertno_sel(label, forward['src']) 55 forward = _restrict_forward_to_src_sel(forward, src_sel) 57 if loose is None: TypeError: cannot unpack non-iterable Exception object ``` ---
**Author:** ![alexrockhill](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/alexrockhill/32/31_2.png) [@alexrockhill](https://mne.discourse.group/u/alexrockhill)\ **Post date:** [May 25, 2023, 10:42pm UTC](https://mne.discourse.group/t/bug-encountered-when-computing-lcmv-spatial-filter-with-a-label/6965/2 "2023-05-25T22:42:34Z")
Could you use the MNE sample data and open an issue on the GitHub with a minimally reproducible example please? Well probably actually `mne.read_labels_from_annot` results a list and so you just want the first element of that list `one_label[0]`. In general, a pro tip is to pay attention to the plurality as in read\_label **s** \_from\_annot which will tell you that it probably returns multiple things in a list and if you only want one thing, you need to grab the first element from that list. ---
**Author:** ![georgekenefati](https://avatars.discourse-cdn.com/v4/letter/g/34f0e0/32.png) [@georgekenefati](https://mne.discourse.group/u/georgekenefati)\ **Post date:** [May 26, 2023, 7:38pm UTC](https://mne.discourse.group/t/bug-encountered-when-computing-lcmv-spatial-filter-with-a-label/6965/3 "2023-05-26T19:38:39Z")
Thanks for your response! Calling `one_label` results in the following output `