WIP native implementation

2 files changed, 2 insertions, 2 deletions

diff --git a/src_py/opcut/libopcut.py b/src_py/opcut/libopcut.py
index b5531aa..d5120cd 100644
--- a/src_py/opcut/libopcut.py
+++ b/src_py/opcut/libopcut.py
@@ -31,7 +31,7 @@ def calculate(method: common.Method,
             raise common.UnresolvableError()
 
         if ret != _lib.OPCUT_SUCCESS:
-            raise Exception()
+            raise Exception("calculation error")
 
         used = list(_decode_used(params, native_used))
         unused = list(_decode_unused(params, native_unused))
diff --git a/src_py/opcut/main.py b/src_py/opcut/main.py
index 958e135..58b3060 100644
--- a/src_py/opcut/main.py
+++ b/src_py/opcut/main.py
@@ -41,7 +41,7 @@ def create_argument_parser() -> argparse.ArgumentParser:
         '--output', metavar='PATH', type=Path, default=Path('-'),
         help=f"output result file path or - for stdout ({result_schema_id})")
     calculate.add_argument(
-        'params', type=Path, default=Path('-'),
+        'params', type=Path, default=Path('-'), nargs='?',
         help=f"input params file path or - for stdin ({params_schema_id})")
 
     generate = subparsers.add_parser('generate')