diff --git a/am2r_yams/wrapper.py b/am2r_yams/wrapper.py
index e8f5479..5966fdd 100644
--- a/am2r_yams/wrapper.py
+++ b/am2r_yams/wrapper.py
@@ -87,10 +87,6 @@ def _load_cs_environment():
 
     clr.AddReference("YAMS-LIB")
 
-def _unload_cs_environment():
-    # Unload dotnet runtime
-    unload()
-
 @contextmanager
 def load_wrapper() -> Wrapper:
     try:
@@ -98,9 +94,7 @@ def load_wrapper() -> Wrapper:
         from YAMS_LIB import Patcher as CSharp_Patcher
         yield Wrapper(CSharp_Patcher)
     except Exception as e:
-        raise YamsException(str(e)) from None
-    finally:
-        _unload_cs_environment
+        raise e
 
 
 def _prepare_environment_and_get_data_win_path(folder: str) -> Path:
diff --git a/am2r_yams_tests/test_meta.py b/am2r_yams_tests/test_meta.py
index b2dcf29..c502abe 100644
--- a/am2r_yams_tests/test_meta.py
+++ b/am2r_yams_tests/test_meta.py
@@ -10,15 +10,14 @@
 @pytest.fixture(scope="session", autouse=True)
 def _mock_load_unload():
     with patch("am2r_yams.wrapper._load_cs_environment") as mocked_load:
-        with patch("am2r_yams.wrapper._unload_cs_environment") as mocked_unload:
-            load("coreclr")
-            import clr
+        load("coreclr")
+        import clr
 
-            clr.AddReference("YAMS-LIB")
-            from YAMS_LIB import Patcher as CSharp_Patcher
+        clr.AddReference("YAMS-LIB")
+        from YAMS_LIB import Patcher as CSharp_Patcher
 
-            yield
-            unload()
+        yield
+        unload()
 
 
 def test_correct_versions():
@@ -38,5 +37,5 @@ def test_throw_correct_exception():
 
             raise System.Exception("Dummy Exception")
 
-    assert excinfo.type is YamsException
+    assert excinfo.type is System.Exception
     assert "Dummy Exception" == str(excinfo.value)