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DOC: Clearer error message for bad events (tuple)

See original GitHub issue

Hello,

I met a problem with mne.epoch() on v18. Please find the example code and the error bellow. (I can share share the data on request) Thank in advance. William

# ==========================ImportPackage=====================================
import mne
import scipy
import numpy as np
from mne.datasets import sample
#=========================================================================
raw = mne.io.read_raw_brainvision(vhdr_fname, misc='auto', scale=1.0, preload=True, verbose=None)
# =================Select all event id or picks from files============================
#event_id = {'S 65': 65, 'S 66': 66}
# ==============================Channels===================================
channels = raw.rename_channels({'1': 'Fp1','2': 'Fz','3': 'F3','4': 'F7','5': 'FT9','6': 'FC5','7': 'FC1','8': 'C3','9': 'T7','10': 'TP9','11': 'CP5', '12': 'CP1','13': 'Pz','14': 'P3','15': 'P7','16': 'O1','17': 'Oz','18': 'O2','19': 'P4','20': 'P8','21': 'TP10','22': 'CP6','23': 'CP2','24': 'Cz', '25': 'C4','26': 'T8','27': 'FT10','28': 'FC6','29': 'FC2','30': 'F4','31': 'F8','32': 'Fp2'})
# =========================Find event in segment===============================
events = mne.events_from_annotations(raw, event_id='auto', regexp='^(?![Bb][Aa][Dd]|[Ee][Dd][Gg][Ee]).*$', use_rounding=True, chunk_duration=None, verbose=None)


events
`_{'New Segment/': 99999, 'Stimulus/S  1': 1, 'Stimulus/S 64': 64, 'Stimulus/S 65': 65, 'Stimulus/S 66': 66, 'Stimulus/S 67': 67, 'Stimulus/S 68': 68, 'Stimulus/S 69': 69, 'Stimulus/S 70': 70, 'Stimulus/S 71': 71, 'Stimulus/S 72': 72, 'Stimulus/S 73': 73, 'Stimulus/S 74': 74, 'Stimulus/S 75': 75, 'Stimulus/S 76': 76, 'Stimulus/S 77': 77, 'Stimulus/S 78': 78, 'Stimulus/S 79': 79, 'Stimulus/S 80': 80, 'Stimulus/S 81': 81, 'Stimulus/S 82': 82, 'Stimulus/S 83': 83, 'Stimulus/S 84': 84, 'Stimulus/S 85': 85, 'Stimulus/S 86': 86, 'Stimulus/S 87': 87, 'Stimulus/S 88': 88, 'Stimulus/S 89': 89, 'Stimulus/S 90': 90, 'Stimulus/S 91': 91, 'Stimulus/S 92': 92, 'Stimulus/S 93': 93, 'Stimulus/S 95': 95, 'Stimulus/S 96': 96, 'Stimulus/S 97': 97, 'Stimulus/S 98': 98, 'Stimulus/S 99': 99, 'Stimulus/S100': 100, 'Stimulus/S101': 101, 'Stimulus/S102': 102, 'Stimulus/S103': 103, 'Stimulus/S104': 104, 'Stimulus/S105': 105, 'Stimulus/S106': 106, 'Stimulus/S107': 107, 'Stimulus/S108': 108, 'Stimulus/S109': 109, 'Stimulus/S110': 110, 'Stimulus/S111': 111, 'Stimulus/S222': 222, 'Stimulus/S224': 224, 'Stimulus/S225': 225, 'Stimulus/S226': 226})_`

# =====================Compute epochs and average============================
epochs = mne.Epochs(raw, events, event_id=[65, 66], tmin=-0.5, tmax=1.0, baseline=(-0.25, 0), picks=None,preload=False, reject=None, flat=None, proj=True, decim=1, reject_tmin=None, reject_tmax=None, detrend=None,on_missing='error', reject_by_annotation=True, metadata=None, verbose=None)



**Traceback (most recent call last):
  File "<input>", line 5, in <module>
  File "</volatile/home/WVxx/.local/lib/python3.7/site-packages/mne/externals/decorator.py:decorator-gen-204>", line 2, in __init__
  File "/volatile/home/WVxx/.local/lib/python3.7/site-packages/mne/utils/_logging.py", line 89, in wrapper
    return function(*args, **kwargs)
  File "/volatile/home/WVxx4/.local/lib/python3.7/site-packages/mne/epochs.py", line 1812, in __init__
    verbose=verbose)
  File "</volatile/home/WVxx/.local/lib/python3.7/site-packages/mne/externals/decorator.py:decorator-gen-195>", line 2, in __init__
  File "/volatile/home/WVxx/.local/lib/python3.7/site-packages/mne/utils/_logging.py", line 89, in wrapper
    return function(*args, **kwargs)
  File "/volatile/home/WVxx/.local/lib/python3.7/site-packages/mne/epochs.py", line 278, in __init__
    'type %s' % (events.dtype))
ValueError: events must be an array of type int, got type object**