conda develop error

(dropseqtools) [ucsd-train25@tscc-login1 software]$ conda develop Drop-seq_tools-1.13
Traceback (most recent call last):
  File "/home/ucsd-train25/anaconda2/bin/conda-develop", line 11, in <module>
    sys.exit(main())
  File "/home/ucsd-train25/anaconda2/lib/python2.7/site-packages/conda_build/cli/main_develop.py", line 72, in main
    return execute(sys.argv[1:])
  File "/home/ucsd-train25/anaconda2/lib/python2.7/site-packages/conda_build/cli/main_develop.py", line 68, in execute
    build_ext=args.build_ext, clean=args.clean, uninstall=args.uninstall)
  File "/home/ucsd-train25/anaconda2/lib/python2.7/site-packages/conda_build/api.py", line 292, in develop
    return execute(recipe_dir, prefix, no_pth_file, build_ext, clean, uninstall)
  File "/home/ucsd-train25/anaconda2/lib/python2.7/site-packages/conda_build/develop.py", line 175, in execute
    write_to_conda_pth(sp_dir, pkg_path)
  File "/home/ucsd-train25/anaconda2/lib/python2.7/site-packages/conda_build/develop.py", line 50, in write_to_conda_pth
    with open(c_file, 'a') as f:
IOError: [Errno 2] No such file or directory: '/home/ucsd-train25/anaconda2/envs/dropseqtools/lib/python2.7/site-packages/conda.pth'