title: CondaValueError: Malformed version string '~': invalid character(s)
body: <p>I'm getting a Malformed version string error with my conda.  I have no idea how to debug this or how to check it. </p>
  
  <p>Can anyone help?  GitHub has talked about the issue but I haven't seen any fixes. </p>
  
  <pre><code>-bash-4.1$ conda install -c bioconda pysam
  Solving environment: failed
  
  
  
   1. CondaValueError: Malformed version string '~': invalid character(s).
  </code></pre>
  
  <p>In response to the comment below: </p>
  
  <pre><code>(mage_env) -bash-4.1$ echo $PATH
  /usr/local/devel/ANNOTATION/jespinoz/anaconda/envs/mage_env/bin:/usr/local/packages/jdk-8u121/bin/:/usr/local/bin:/usr/local/devel/ANNOTATION/rrichter/local/bin:/home/syooseph/utils/clustalw1.83:/usr/local/packages/gsl/bin:/usr/local/sge_current/bin/lx-amd64:/usr/lib64/qt-3.3/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/local/devel/ANNOTATION/jespinoz/anaconda/bin:/usr/local/devel/ANNOTATION/jespinoz/Dropseq/:/usr/local/devel/ANNOTATION/jespinoz/Dropseq/Drop-seq_tools-1.13/
  (mage_env) -bash-4.1$ conda info
  
       active environment : mage_env
      active env location : /usr/local/devel/ANNOTATION/jespinoz/anaconda/envs/mage_env
              shell level : 1
         user config file : /home/jespinoz/.condarc
   populated config files : /home/jespinoz/.condarc
            conda version : 4.5.11
      conda-build version : not installed
           python version : 3.6.2.final.0
         base environment : /usr/local/devel/ANNOTATION/jespinoz/anaconda  (writable)
             channel URLs : https://conda.anaconda.org/ursky/linux-64
                            https://conda.anaconda.org/ursky/noarch
                            https://conda.anaconda.org/bioconda/linux-64
                            https://conda.anaconda.org/bioconda/noarch
                            https://conda.anaconda.org/conda-forge/linux-64
                            https://conda.anaconda.org/conda-forge/noarch
                            https://repo.anaconda.com/pkgs/main/linux-64
                            https://repo.anaconda.com/pkgs/main/noarch
                            https://repo.anaconda.com/pkgs/free/linux-64
                            https://repo.anaconda.com/pkgs/free/noarch
                            https://repo.anaconda.com/pkgs/r/linux-64
                            https://repo.anaconda.com/pkgs/r/noarch
                            https://repo.anaconda.com/pkgs/pro/linux-64
                            https://repo.anaconda.com/pkgs/pro/noarch
            package cache : /usr/local/devel/ANNOTATION/jespinoz/anaconda/pkgs
                            /home/jespinoz/.conda/pkgs
         envs directories : /usr/local/devel/ANNOTATION/jespinoz/anaconda/envs
                            /home/jespinoz/.conda/envs
                 platform : linux-64
               user-agent : conda/4.5.11 requests/2.14.2 CPython/3.6.2 Linux/2.6.32-696.18.7.el6.x86_64 centos/6.4 glibc/2.12
                  UID:GID : 3456:63
               netrc file : None
             offline mode : False
  </code></pre>