title: CondaValueError: Value error: prefix already exists:
body: <p>Reference:</p>
  
  <p><a href="https://uoa-eresearch.github.io/eresearch-cookbook/recipe/2014/11/20/conda/" rel="noreferrer">https://uoa-eresearch.github.io/eresearch-cookbook/recipe/2014/11/20/conda/</a></p>
  
  <p>I've run the following commands to install conda and create a virtual environment.  Continue reading after code block for my question.</p>
  
  <pre><code>C:\Windows\System32&gt;conda -V
  conda 4.1.11
  
  C:\Windows\System32&gt;conda update conda
  Fetching package metadata .........
  Solving package specifications: ..........
  
  Package plan for installation in environment C:\Program Files\Miniconda2:
  
  The following packages will be downloaded:
  
      package                    |            build
      ---------------------------|-----------------
      conda-env-2.6.0            |                0          498 B
      enum34-1.1.6               |           py27_0          53 KB
      conda-4.2.9                |           py27_0         421 KB
      ------------------------------------------------------------
                                             Total:         475 KB
  
  The following NEW packages will be INSTALLED:
  
      enum34:    1.1.6-py27_0
  
  The following packages will be UPDATED:
  
      conda:     4.1.11-py27_0 --&gt; 4.2.9-py27_0
      conda-env: 2.5.2-py27_0  --&gt; 2.6.0-0
  
  Proceed ([y]/n)? y
  
  Fetching packages ...
  conda-env-2.6. 100% |###############################| Time: 0:00:00  99.60 kB/s
  enum34-1.1.6-p 100% |###############################| Time: 0:00:00 719.03 kB/s
  conda-4.2.9-py 100% |###############################| Time: 0:00:00   1.33 MB/s
  Extracting packages ...
  [      COMPLETE      ]|##################################################| 100%
  Unlinking packages ...
  [      COMPLETE      ]|##################################################| 100%
  Linking packages ...
  [      COMPLETE      ]|##################################################| 100%
  
  C:\Windows\System32&gt;
  
  
  C:\Windows\System32&gt;Python -V
  Python 2.7.12
  
  C:\Windows\System32&gt;conda create -n ENV1 python=2.7.12 anaconda
  
  ...
  
  &lt;-- chose 'n' for install
  </code></pre>
  
  <p>I chose 'n' here, because this is when I crashed my Linux server because I ran out of disk space when a billion programs (give or take) were asked to be installed.  Instead, I chose 'n', and then wanted to log this to a file so I could see the entire list because I couldn't scroll up in the Windows command prompt, so I ran the code below instead.  It sat for a while, and then I broke out using CTRL+C.  Continue reading after code block for my question.</p>
  
  <pre><code>C:\Windows\System32&gt;conda create -n ENV1 python=2.7.12 anaconda &gt; C:\output.txt
  
  y
  Traceback (most recent call last):
    File "C:\Program Files\Miniconda2\Scripts\conda-script.py", line 5, in &lt;module
  &gt;
      sys.exit(conda.cli.main())
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\cli\main.py", line 1
  50, in main
      return conda_exception_handler(_main)
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\exceptions.py", line
   473, in conda_exception_handler
      return_value = func(*args, **kwargs)
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\cli\main.py", line 1
  44, in _main
      exit_code = args.func(args, p)
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\cli\main_create.py",
   line 68, in execute
      install(args, parser, 'create')
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\cli\install.py", lin
  e 405, in install
      execute_actions(actions, index, verbose=not context.quiet)
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\plan.py", line 643,
  in execute_actions
      inst.execute_instructions(plan, index, verbose)
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\instructions.py", li
  ne 134, in execute_instructions
      cmd(state, arg)
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\instructions.py", li
  ne 47, in FETCH_CMD
      fetch_pkg(state['index'][arg + '.tar.bz2'])
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\fetch.py", line 336,
   in fetch_pkg
      download(url, path, session=session, md5=info['md5'], urlstxt=True)
    File "C:\Program Files\Miniconda2\lib\site-packages\conda\fetch.py", line 419,
   in download
      for chunk in resp.iter_content(2**14):
    File "C:\Program Files\Miniconda2\lib\site-packages\requests\models.py", line
  664, in generate
      for chunk in self.raw.stream(chunk_size, decode_content=True):
    File "C:\Program Files\Miniconda2\lib\site-packages\requests\packages\urllib3\
  response.py", line 353, in stream
      data = self.read(amt=amt, decode_content=decode_content)
    File "C:\Program Files\Miniconda2\lib\site-packages\requests\packages\urllib3\
  response.py", line 310, in read
      data = self._fp.read(amt)
    File "C:\Program Files\Miniconda2\lib\httplib.py", line 612, in read
      s = self.fp.read(amt)
    File "C:\Program Files\Miniconda2\lib\socket.py", line 384, in read
      data = self._sock.recv(left)
    File "C:\Program Files\Miniconda2\lib\ssl.py", line 756, in recv
      return self.read(buflen)
    File "C:\Program Files\Miniconda2\lib\ssl.py", line 643, in read
      v = self._sslobj.read(len)
  KeyboardInterrupt
  
  C:\Windows\System32&gt;conda create -n ENV1 python=2.7.12 anaconda &gt; C:\output.txt
  
  CondaValueError: Value error: prefix already exists: C:\Program Files\Miniconda2
  \envs\ENV1
  </code></pre>
  
  <p>How can I remove the ENV1 prefix so I can try re-installing?  And how can I log all of this output in Windows.  The input is not visible if I move to C:\output.txt.</p>