Cannot connect to existing ipython kernel after upgrading to 3.0

[huyiqun]

Description of your problem

What steps will reproduce the problem?

From connect to an existing kernel and paste the kernel address obtained from %connect_info from another python program

What is the expected output? What do you see instead?
Expected to successfully connect. Instead see error message from internal console:

WARNING:root:kernel died: 3.00172996521
Traceback (most recent call last):
File "/Users/h/anaconda2/lib/python2.7/site-packages/spyder/plugins/ipythonconsole.py", line 898, in create_client_for_kernel
password)
File "/Users/h/anaconda2/lib/python2.7/site-packages/spyder/plugins/ipythonconsole.py", line 1407, in _create_client_for_kernel
kernel_client.load_connection_file()
File "/Users/h/anaconda2/lib/python2.7/site-packages/jupyter_client/connect.py", line 417, in load_connection_file
with open(self.connection_file) as f:
IOError: [Errno 2] No such file or directory: u'--existing /Users/h/Library/Jupyter/runtime/kernel-200d2980-48d4-4c4a-a956-10c0249f01d0.json'

Please provide any additional information below
Spyder 2.3.9 is running just fine. After upgraded to spyder 3.0, this error occurred.

Versions and main components

• Spyder Version: 3.0
• Python Version: 2.7.12
• Operating system: OS X (same from windows 7)

Dependencies

Please go to the menu entry Help > Optional Dependencies (or
Help > Dependencies), press the button Copy to clipboard
and paste the contents below:

jedi >=0.8.1 : 0.9.0 (OK)
matplotlib >=1.0 : 1.5.3 (OK)
nbconvert >=4.0 : 4.2.0 (OK)
numpy >=1.7 : 1.11.1 (OK)
pandas >=0.13.1 : 0.18.1 (OK)
pep8 >=0.6 : 1.7.0 (OK)
psutil >=0.3 : 4.3.0 (OK)
pyflakes >=0.5.0 : 1.2.3 (OK)
pygments >=2.0 : 2.1.3 (OK)
pylint >=0.25 : 1.5.4 (OK)
qtconsole >=4.2.0: 4.2.1 (OK)
rope >=0.9.4 : 0.9.4 (OK)
sphinx >=0.6.6 : 1.4.1 (OK)
sympy >=0.7.3 : 1.0 (OK)

[ccordoba12]

Where did you run %connect_info? In a notebook?

[huyiqun]

I have tried with notebook, qtconsole and atom (hydrogen).

[ccordoba12]

And where are exactly placed your kernel json files? I mean, in which directory?

[huyiqun]

I did not manually place them I think. %connect_info shows that it is at /Users/h/Library/Jupyter/runtime/kernel-200d2980-48d4-4c4a-a956-10c0249f01d0.json and I checked it is indeed there.