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ERROR: test_4d_cube_2_dims (iris.tests.analysis.test_stats.Test_corr)
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Traceback (most recent call last):
  File "iris/tests/analysis/test_stats.py", line 38, in setUp
    'ensemble_001.pp'))
  File "/iris/__init__.py", line 327, in load_cube
    cubes = _load_collection(uris, constraints, callback).merged().cubes()
  File "lib/iris/__init__.py", line 267, in _load_collection
    result = iris.cube._CubeFilterCollection.from_cubes(cubes, constraints)
  File "lib/iris/cube.py", line 139, in from_cubes
    for cube in cubes:
  File "lib/iris/__init__.py", line 254, in _generate_cubes
    for cube in iris.io.load_files(part_names, callback, constraints):
  File "lib/iris/io/__init__.py", line 183, in load_files
    all_file_paths = expand_filespecs(filenames)
  File "lib/iris/io/__init__.py", line 166, in expand_filespecs
    for pattern, expanded in glob_expanded.iteritems()])
IOError: One or more of the files specified did not exist ['iris/sample_data/GloSea4/ensemble_001.pp expanded to empty'].