Traceback (most recent call last):
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/pandas/core/indexes/base.py", line 2657, in get_loc
    return self._engine.get_loc(key)
  File "pandas/_libs/index.pyx", line 108, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/index.pyx", line 132, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/hashtable_class_helper.pxi", line 1601, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas/_libs/hashtable_class_helper.pxi", line 1608, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: 'TACGTATGTGGCAAGCGTTATCCGGATTTATTGGGCGTAAAGCGAGCGCAGGCGGTCTTTTAAGTCTAATGTGAAAGCCTTCGGCTCAACCGAAGAAGTGCATTGGAAACTGGGAGACTTGAGTGCAGAAGAGGACAGTGGAACTCCATG'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/q2cli/commands.py", line 327, in __call__
    results = action(**arguments)
  File "</home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/decorator.py:decorator-gen-492>", line 2, in paired_heatmap
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/qiime2/sdk/action.py", line 240, in bound_callable
    output_types, provenance)
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/qiime2/sdk/action.py", line 445, in _callable_executor_
    ret_val = self._callable(output_dir=temp_dir, **view_args)
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/mmvec/q2/_visualizers.py", line 72, in paired_heatmap
    color_palette)
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/mmvec/heatmap.py", line 201, in paired_heatmaps
    for f in features] for m in x).keys()
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/mmvec/heatmap.py", line 201, in <listcomp>
    for f in features] for m in x).keys()
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/pandas/core/indexing.py", line 1500, in __getitem__
    return self._getitem_axis(maybe_callable, axis=axis)
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/pandas/core/indexing.py", line 1913, in _getitem_axis
    return self._get_label(key, axis=axis)
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/pandas/core/indexing.py", line 141, in _get_label
    return self.obj._xs(label, axis=axis)
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/pandas/core/generic.py", line 3585, in xs
    loc = self.index.get_loc(key)
  File "/home/qianhang/miniconda3/envs/qiime2-2019.7/lib/python3.6/site-packages/pandas/core/indexes/base.py", line 2659, in get_loc
    return self._engine.get_loc(self._maybe_cast_indexer(key))
  File "pandas/_libs/index.pyx", line 108, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/index.pyx", line 132, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/hashtable_class_helper.pxi", line 1601, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas/_libs/hashtable_class_helper.pxi", line 1608, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: 'TACGTATGTGGCAAGCGTTATCCGGATTTATTGGGCGTAAAGCGAGCGCAGGCGGTCTTTTAAGTCTAATGTGAAAGCCTTCGGCTCAACCGAAGAAGTGCATTGGAAACTGGGAGACTTGAGTGCAGAAGAGGACAGTGGAACTCCATG'