diff --git a/divvy/__main__.py b/divvy/__main__.py
new file mode 100644
index 0000000..ef96ac5
--- /dev/null
+++ b/divvy/__main__.py
@@ -0,0 +1,9 @@
+from .compute import main
+import sys
+
+if __name__ == '__main__':
+    try:
+        sys.exit(main())
+    except KeyboardInterrupt:
+        print("Program canceled by user!")
+        sys.exit(1)
diff --git a/divvy/_version.py b/divvy/_version.py
index 6a9beea..3d26edf 100644
--- a/divvy/_version.py
+++ b/divvy/_version.py
@@ -1 +1 @@
-__version__ = "0.4.0"
+__version__ = "0.4.1"
diff --git a/divvy/compute.py b/divvy/compute.py
index 308b61c..2967b72 100644
--- a/divvy/compute.py
+++ b/divvy/compute.py
@@ -12,6 +12,7 @@
 from distutils.dir_util import copy_tree
 
 # from attmap import PathExAttMap
+from ubiquerg import is_writable
 import yacman
 from collections import OrderedDict
 
@@ -20,13 +21,14 @@
 from .utils import parse_config_file, write_submit_script, get_first_env_var
 from . import __version__
 
-DEFAULT_CONFIG_FILEPATH =  os.path.join(
+DEFAULT_CONFIG_FILEPATH = os.path.join(
         os.path.dirname(__file__),
         "default_config",
         "divvy_config.yaml")
 
 _LOGGER = logging.getLogger(__name__)
 
+
 class ComputingConfiguration(yacman.YacAttMap):
     """
     Represents computing configuration objects.
@@ -65,8 +67,8 @@ def __init__(self, entries=None, filepath=None,
         super(ComputingConfiguration, self).__init__(entries, filepath)
 
         if not hasattr(self, "compute_packages"):
-            raise Exception("Your config file is not in divvy config format (it"
-            " lacks a compute_packages section)")
+            raise Exception("Your divvy config file is not in divvy config format (it"
+            " lacks a compute_packages section): '{}'".format(filepath))
             # We require that compute_packages be present, even if empty
             self.compute_packages = {}
 
@@ -78,7 +80,7 @@ def __init__(self, entries=None, filepath=None,
 
     def write(self, filename=None):
         super(ComputingConfiguration, self).write(filename)
-        filename = filename or getattr(self, FILEPATH_KEY)
+        filename = filename or getattr(self, yacman.FILEPATH_KEY)
         filedir = os.path.dirname(filename)
         # For this object, we *also* have to write the template files
         for pkg_name, pkg in self.compute_packages.items():
@@ -313,33 +315,6 @@ def divvy_init(config_path, template_config_path):
         _LOGGER.warning("Can't initialize, file exists: {} ".format(config_path))
 
 
-def _is_writeable(folder, check_exist=False, create=False):
-    """
-    Make sure a folder is writable.
-
-    Given a folder, check that it exists and is writable. Errors if requested on
-    a non-existent folder. Otherwise, make sure the first existing parent folder
-    is writable such that this folder could be created.
-
-    :param str folder: Folder to check for writeability.
-    :param bool check_exist: Throw an error if it doesn't exist?
-    :param bool create: Create the folder if it doesn't exist?
-    """
-    folder = folder or "."
-
-    if os.path.exists(folder):
-        return os.access(folder, os.W_OK) and os.access(folder, os.X_OK)
-    elif create_folder:
-        os.mkdir(folder)
-    elif check_exist:
-        raise OSError("Folder not found: {}".format(folder))
-    else:
-        _LOGGER.debug("Folder not found: {}".format(folder))
-        # The folder didn't exist. Recurse up the folder hierarchy to make sure
-        # all paths are writable
-        return _is_writeable(os.path.dirname(folder), strict_exists)
-
-
 def build_argparser():
     """
     Builds argument parser.
@@ -351,6 +326,7 @@ def build_argparser():
     additional_description = "\nhttps://divvy.databio.org"
 
     parser = _VersionInHelpParser(
+            prog="divvy",
             description=banner,
             epilog=additional_description)
 
@@ -416,11 +392,10 @@ def main():
     keys = [str.replace(x, "--", "") for x in remaining_args[::2]]
     cli_vars = dict(zip(keys, remaining_args[1::2]))
 
-
     if args.command == "init":
         divcfg = args.config
         _LOGGER.debug("Initializing divvy configuration")
-        _is_writable(os.path.dirname(divcfg), check_exist=False)
+        is_writable(os.path.dirname(divcfg), check_exist=False)
         divvy_init(divcfg, DEFAULT_CONFIG_FILEPATH)
         sys.exit(0)      
 
@@ -449,11 +424,3 @@ def main():
     else:
         vars_groups = [cli_vars]
     dcc.write_script(args.outfile, vars_groups)
-
-
-if __name__ == '__main__':
-    try:
-        sys.exit(main())
-    except KeyboardInterrupt:
-        _LOGGER.error("Program canceled by user!")
-        sys.exit(1)
diff --git a/docs/changelog.md b/docs/changelog.md
index 83f7e31..83476d6 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## [0.4.1] -- 2020-03-20
+### Fixed
+- `NameError` in `divvy init`; [#44](https://github.com/pepkit/divvy/issues/44)
+
+### Added
+- possibility to execute library module as a script: `python -m divvy ...`
+
+### Changed
+- improved error message when config format is incompatible
+
 ## [0.4.0] -- 2019-07-30
 ### Added
 - Default templates for singularity and docker compute packages
diff --git a/requirements/requirements-all.txt b/requirements/requirements-all.txt
index 73b0710..f72e9fc 100644
--- a/requirements/requirements-all.txt
+++ b/requirements/requirements-all.txt
@@ -3,3 +3,4 @@ yacman>=0.5.0
 pandas>=0.20.2
 pyyaml>=5.1
 logmuse>=0.2.0
+ubiquerg>=0.5.0
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 1008add..bb12c5a 100644
--- a/setup.py
+++ b/setup.py
@@ -62,10 +62,10 @@
     url="https://github.com/pepkit/{}/".format(PACKAGE),
     author=u"Nathan Sheffield, Vince Reuter, Michal Stolarczyk",
     author_email=u"nathan@code.databio.org, vreuter@virginia.edu, mjs5kd@virginia.edu", 
-    license="BSD2",
+    license="BSD-2-Clause",
     entry_points={
         "console_scripts": [
-            'divvy = divvy.compute:main'
+            'divvy = divvy.__main__:main'
         ],
     },    
     package_data={"divvy": [os.path.join("divvy", "*")]},
diff --git a/tests/conftest.py b/tests/conftest.py
index 67ffadb..64e3774 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -22,6 +22,8 @@ def dcc(request):
     return divvy.ComputingConfiguration(request.param)
 
 
-
+@pytest.fixture
+def mock_env_missing(monkeypatch):
+    [monkeypatch.delenv(env_var, raising=False) for env_var in divvy.const.COMPUTE_SETTINGS_VARNAME]
 
 
diff --git a/tests/divvy_tests/test_divvy.py b/tests/divvy_tests/test_divvy.py
index 954c20c..9ad6038 100644
--- a/tests/divvy_tests/test_divvy.py
+++ b/tests/divvy_tests/test_divvy.py
@@ -3,7 +3,8 @@
 import pytest
 from yacman import YacAttMap, load_yaml
 from divvy import DEFAULT_COMPUTE_RESOURCES_NAME
-from tests.conftest import DCC_ATTRIBUTES, FILES
+from tests.conftest import DCC_ATTRIBUTES, FILES, mock_env_missing
+
 
 class DefaultDCCTests:
     """ Tests the default divvy.ComputingConfiguration object creation"""
@@ -17,6 +18,9 @@ def test_attrs_produced(self, att, empty_dcc):
         """ Test if compute property is produced and is not empty """
         empty_dcc[att]
 
+    def test_no_env_var(self, mock_env_missing, empty_dcc):
+        empty_dcc
+
 
 class DCCTests:
     """ Tests the divvy.ComputingConfiguration object creation """