Import caffe Error: TypeError: constructor returned NULL

[X X]

I installed cpu-version caffe on cortex-a53 according to official guide from github.com/BVLC/caffe/wiki/ Ubuntu 16.04 or 15.10 Installation Guide. However, when I tried to import caffe package, it showed below error messages: 

Python 2.7.9 (default, Sep 17 2016, 20:26:04) 

[GCC 4.9.2] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> import caffe

Unable to init server: Could not connect: Connection refused

Unable to init server: Could not connect: Connection refused

(.:11007): Gdk-CRITICAL **: gdk_cursor_new_for_display: assertion 'GDK_IS_DISPLAY (display)' failed

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/home/yuanshuai/code/caffe/python/caffe/__init__.py", line 1, in <module>

    from .pycaffe import Net, SGDSolver, NesterovSolver, AdaGradSolver, RMSPropSolver, AdaDeltaSolver, AdamSolver, NCCL, Timer

  File "/home/yuanshuai/code/caffe/python/caffe/pycaffe.py", line 15, in <module>

    import caffe.io

  File "/home/yuanshuai/code/caffe/python/caffe/io.py", line 2, in <module>

    import skimage.io

  File "/usr/local/lib/python2.7/dist-packages/skimage/io/__init__.py", line 15, in <module>

    reset_plugins()

  File "/usr/local/lib/python2.7/dist-packages/skimage/io/manage_plugins.py", line 93, in reset_plugins

    _load_preferred_plugins()

  File "/usr/local/lib/python2.7/dist-packages/skimage/io/manage_plugins.py", line 73, in _load_preferred_plugins

    _set_plugin(p_type, preferred_plugins['all'])

  File "/usr/local/lib/python2.7/dist-packages/skimage/io/manage_plugins.py", line 85, in _set_plugin

    use_plugin(plugin, kind=plugin_type)

  File "/usr/local/lib/python2.7/dist-packages/skimage/io/manage_plugins.py", line 255, in use_plugin

    _load(name)

  File "/usr/local/lib/python2.7/dist-packages/skimage/io/manage_plugins.py", line 299, in _load

    fromlist=[modname])

  File "/usr/local/lib/python2.7/dist-packages/skimage/io/_plugins/matplotlib_plugin.py", line 3, in <module>

    import matplotlib.pyplot as plt

  File "/usr/local/lib/python2.7/dist-packages/matplotlib/pyplot.py", line 114, in <module>

    _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()

  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backends/__init__.py", line 32, in pylab_setup

    globals(),locals(),[backend_name],0)

  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_gtk3agg.py", line 11, in <module>

    from . import backend_gtk3

  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_gtk3.py", line 58, in <module>

    cursors.MOVE          : Gdk.Cursor.new(Gdk.CursorType.FLEUR),

TypeError: constructor returned NULL

>>> 

[X X]

I solved it after adding `make pycaffe`

在 2017年4月10日星期一 UTC+8上午10:02:55，X X写道：