Improve error message when no files found to bundle

src/flyte/_code_bundle/bundle.py

@@ -14,6 +14,7 @@
 
 from flyte._logging import log, logger
 from flyte._utils import AsyncLRUCache
+from flyte.errors import CodeBundleError
 from flyte.models import CodeBundle
 
 from ._ignore import GitIgnore, Ignore, StandardIgnore
@@ -144,6 +145,16 @@ async def build_code_bundle(
 
     logger.debug(f"Finding files to bundle, ignoring as configured by: {ignore}")
     files, digest = list_files_to_bundle(from_dir, True, *ignore, copy_style=copy_style)
+    if len(files) == 0:
+        raise CodeBundleError(
+            f"No files found to bundle in '{from_dir}'.\n"
+            "Possible causes:\n"
+            "  - The task file is inside a virtual environment directory (e.g., .venv/, venv/)\n"
+            "  - The task file is excluded by .gitignore\n"
+            "  - The directory does not contain any Python files\n"
+            "To debug, check that your task file exists in the specified directory and is not ignored."
+        )
+
     if logger.getEffectiveLevel() <= logging.INFO:
         print_ls_tree(from_dir, files)
 

src/flyte/cli/_run.py

@@ -251,7 +251,7 @@ async def _execute_and_render(self, ctx: click.Context, config: common.CLIConfig
                 result = await execution_context.run.aio(self.obj, **ctx.params)
         except Exception as e:
             console.print(common.get_panel("Exception", f"[red]✕ Execution failed:[/red] {e}", config.output_format))
-            raise
+            exit(1)
 
         # 3. UI Branching
         if self.run_args.local:

src/flyte/errors.py

@@ -274,3 +274,12 @@ class RestrictedTypeError(RuntimeUserError):
 
     def __init__(self, message: str):
         super().__init__("RestrictedTypeUsage", message, "user")
+
+
+class CodeBundleError(RuntimeUserError):
+    """
+    This error is raised when the code bundle cannot be created, for example when no files are found to bundle.
+    """
+
+    def __init__(self, message: str):
+        super().__init__("CodeBundleError", message, "user")