Python3 Kernel error after anaconda install

I am unable to run jupyter notebook successfully, and am getting the error FileNotFoundError: [Errno 2] No such file or directory: '//anaconda/envs/py35/bin/python'. I have uninstalled anaconda and jupyter and reinstalled, but am still getting the same result.

How do I solve it?

Traceback (most recent call last):
  File "/Users/martin/anaconda/lib/python3.5/site-packages/notebook/base/handlers.py", line 458, in wrapper
    result = yield gen.maybe_future(method(self, *args, **kwargs))
  File "/Users/martin/anaconda/lib/python3.5/site-packages/tornado/gen.py", line 1008, in run
    value = future.result()
  File "/Users/martin/anaconda/lib/python3.5/site-packages/tornado/concurrent.py", line 232, in result
    raise_exc_info(self._exc_info)
  File "<string>", line 3, in raise_exc_info
  File "/Users/martin/anaconda/lib/python3.5/site-packages/tornado/gen.py", line 1014, in run
    yielded = self.gen.throw(*exc_info)
  File "/Users/martin/anaconda/lib/python3.5/site-packages/notebook/services/sessions/handlers.py", line 58, in post
    sm.create_session(path=path, kernel_name=kernel_name))
  File "/Users/martin/anaconda/lib/python3.5/site-packages/tornado/gen.py", line 1008, in run
    value = future.result()
  File "/Users/martin/anaconda/lib/python3.5/site-packages/tornado/concurrent.py", line 232, in result
    raise_exc_info(self._exc_info)
  File "<string>", line 3, in raise_exc_info
  File "/Users/martin/anaconda/lib/python3.5/site-packages/tornado/gen.py", line 1014, in run
    yielded = self.gen.throw(*exc_info)
  File "/Users/martin/anaconda/lib/python3.5/site-packages/notebook/services/sessions/sessionmanager.py", line 73, in create_session
    self.kernel_manager.start_kernel(path=kernel_path, kernel_name=kernel_name)
  File "/Users/martin/anaconda/lib/python3.5/site-packages/tornado/gen.py", line 1008, in run
    value = future.result()
  File "/Users/martin/anaconda/lib/python3.5/site-packages/tornado/concurrent.py", line 232, in result
    raise_exc_info(self._exc_info)
  File "<string>", line 3, in raise_exc_info
  File "/Users/martin/anaconda/lib/python3.5/site-packages/tornado/gen.py", line 282, in wrapper
    yielded = next(result)
  File "/Users/martin/anaconda/lib/python3.5/site-packages/notebook/services/kernels/kernelmanager.py", line 87, in start_kernel
    super(MappingKernelManager, self).start_kernel(**kwargs)
  File "/Users/martin/anaconda/lib/python3.5/site-packages/jupyter_client/multikernelmanager.py", line 110, in start_kernel
    km.start_kernel(**kwargs)
  File "/Users/martin/anaconda/lib/python3.5/site-packages/jupyter_client/manager.py", line 243, in start_kernel
    **kw)
  File "/Users/martin/anaconda/lib/python3.5/site-packages/jupyter_client/manager.py", line 189, in _launch_kernel
    return launch_kernel(kernel_cmd, **kw)
  File "/Users/martin/anaconda/lib/python3.5/site-packages/jupyter_client/launcher.py", line 123, in launch_kernel
    proc = Popen(cmd, **kwargs)
  File "/Users/martin/anaconda/lib/python3.5/subprocess.py", line 950, in __init__
    restore_signals, start_new_session)
  File "/Users/martin/anaconda/lib/python3.5/subprocess.py", line 1544, in _execute_child
    raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: '//anaconda/envs/py35/bin/python'

[takluyver]

I’m guessing that you reinstalled your python2 kernelspec, but not the python3 one, and the notebook you’re getting from another user has python3 in the metadata. You’ll probably need to create or switch to a Python 3 environment, install ipykernel and run python -m ipykernel install --user again.

[soedr]

I get

Available kernels:
  python2    /Users/martin/Library/Jupyter/kernels/python2
  python3    /Users/martin/Library/Jupyter/kernels/python3

However, I reinstalled ipykernel using python2 -m pip install ipykernel and python2 -m ipykernel install --user and that seems to have solved the problem!