diff --git a/bean/framework/ReporterScreen.py b/bean/framework/ReporterScreen.py
index fff5a09..f8a4629 100755
--- a/bean/framework/ReporterScreen.py
+++ b/bean/framework/ReporterScreen.py
@@ -483,7 +483,7 @@ def get_guide_edit_rate(
         return_result=False,
         count_layer="X_bcmatch",
         edit_layer="edits",
-        condition_col = "condition",
+        condition_col="condition",
         unsorted_condition_label=None,
     ):
         """
@@ -507,12 +507,14 @@ def get_guide_edit_rate(
             )
         if unsorted_condition_label is not None:
             bulk_idx = np.where(
-                self.samples[condition_col].astype(str).map(
-                    lambda s: unsorted_condition_label in s
-                )
+                self.samples[condition_col]
+                .astype(str)
+                .map(lambda s: unsorted_condition_label in s)
             )[0]
             if len(bulk_idx) == 0:
-                raise ValueError(f"{unsorted_condition_label} is not found in ReporterScreen.samples['{condition_col}]. Check your input.")
+                raise ValueError(
+                    f"'{unsorted_condition_label}' is not found in ReporterScreen.samples['{condition_col}'] that has values {self.samples[condition_col].unique()}. Check your input."
+                )
         else:
             bulk_idx = np.arange(0, len(self.samples)).astype(int)