diff --git a/oephys2nix/main.py b/oephys2nix/main.py
index 1b6d48e..1c783f1 100644
--- a/oephys2nix/main.py
+++ b/oephys2nix/main.py
@@ -35,6 +35,13 @@ def main(
     log.info(f"Selected data_path is {data_path}")
     open_ephys_data_paths = list(Path(data_path).rglob("*open-ephys"))
     relacs_data_paths = list(Path(data_path).rglob("*relacs/*.nix"))
+    if not open_ephys_data_paths:
+        log.error("Did not find any open-ephys data")
+        raise typer.Exit()
+
+    if not relacs_data_paths:
+        log.error("Did not find any relacs data")
+        raise typer.Exit()
 
     if len(open_ephys_data_paths) != len(relacs_data_paths):
         log.error(