so when I try to plot the trial-averaged hand-pos trajectory, problems ocuured

[JasonNerd]

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IndexError                                Traceback (most recent call last)
Cell In[22], line 19
     17 traj = trial_data.groupby('align_time')[[('hand_pos', 'x'), ('hand_pos', 'y')]].mean().to_numpy()
     18 # Determine reach angle for color
---> 19 active_target = dataset.trial_info[mask].target_pos.iloc[0][dataset.trial_info[mask].active_target.iloc[0]]
     20 reach_angle = np.arctan2(*active_target[::-1])
     21 # Plot reach

IndexError: only integers, slices (`:`), ellipsis (`...`), numpy.newaxis (`None`) and integer or boolean arrays are valid indices