diff --git a/gmso/external/convert_hoomd.py b/gmso/external/convert_hoomd.py
index ccc5b82dd..6a733feae 100644
--- a/gmso/external/convert_hoomd.py
+++ b/gmso/external/convert_hoomd.py
@@ -1108,11 +1108,6 @@ def _parse_dihedral_forces(
         expected_unitsDict[group] = potential_refs[group][
             "expected_parameters_dimensions"
         ]
-        # groups[group] = _convert_connection_params_units(
-        #    groups[group],
-        #    expected_units_dim,
-        #    base_units,
-        # )
     dtype_group_map = {
         "OPLSTorsionPotential": {
             "container": hoomd.md.dihedral.OPLS,
@@ -1176,7 +1171,10 @@ def _parse_dihedral_forces(
                     base_units=base_units,
                 )
             )
-            raise ValueError
+        else:
+            raise GMSOError(
+                f"Current version of HOOMD-blue, {hoomd_version}. is not supported. Please updated for version 3.8 or later."
+            )
     return dihedral_forces
 
 
diff --git a/gmso/utils/units.py b/gmso/utils/units.py
index 29f4b1387..fbd4f8032 100644
--- a/gmso/utils/units.py
+++ b/gmso/utils/units.py
@@ -504,7 +504,26 @@ def convert_params_units(
     expected_units_dim,
     base_units,
 ):
-    """Convert parameters' units in the potential to that specified in the base_units."""
+    """Convert parameters' units in the potential to that specified in the base_units.
+
+    Parameters
+    ----------
+    potentials : list
+        Set of potentials to apply the conversion to.
+    expected_units_dim : dict
+        The dimensionality expected for all parameters in the potential. This allows
+        the given dimensions to be converted to via the base_units specified in the
+        unit system.
+    base_units : dict
+        The units to use for conversion. Must have keys of "length", "energy",
+        and "mass". These are the base units any parameter will be converted into.
+
+    Returns
+    -------
+    converted_potentials : list
+        the input potentials converted into the base units given by
+        base_units `dict`.
+    """
     converted_potentials = list()
     for potential in potentials:
         converted_params = dict()