Fix Better error message in development when version number changes. (#4188)

openhands/runtime/utils/runtime_build.py

@@ -57,7 +57,7 @@ def _put_source_code_to_dir(temp_dir: str):
         raise RuntimeError(f'Image build failed:\n{result}')
 
     if not os.path.exists(tarball_path):
-        logger.error(f'Source distribution not found at {tarball_path}')
+        logger.error(f'Source distribution not found at {tarball_path}. (Do you need to run `make build`?)')
         raise RuntimeError(f'Source distribution not found at {tarball_path}')
     logger.info(f'Source distribution created at {tarball_path}')