diff --git a/pyrelacs/repros/repros.py b/pyrelacs/repros/repros.py
index f1bd258..89171cb 100644
--- a/pyrelacs/repros/repros.py
+++ b/pyrelacs/repros/repros.py
@@ -4,6 +4,7 @@ import ast
 import pathlib
 
 from IPython import embed
+import nixio as nix
 from pyrelacs.util.logging import config_logging
 
 log = config_logging()
@@ -13,22 +14,24 @@ class Repro:
     def __init__(self) -> None:
         pass
 
-    def run_repro(self, name: str, file: pathlib.Path, *args, **kwargs) -> None:
+    def run_repro(
+        self, nix_file: nix.File, name: str, file: pathlib.Path, *args, **kwargs
+    ) -> None:
         spec = importlib.util.spec_from_file_location("rep", file)
         if not spec:
-            log.error("Could not load the repro")
+            log.error("Could not load the file")
         else:
             module = importlib.util.module_from_spec(spec)
             if not module:
-                log.error("Could not load Class of the repro")
+                log.error("Could not load the module of the repro")
             else:
                 sys.modules[name] = module
                 spec.loader.exec_module(module)
                 if hasattr(module, name):
                     rep_class = getattr(module, name)
-                    rep_class.run()
+                    rep_class.run(nix_file)
                 else:
-                    raise AttributeError(f"{name} has no run function")
+                    raise AttributeError(f"{file.name} has no {name} class")
 
     def names_of_repros(self):
         file_path_cur = pathlib.Path(__file__).parent