diff --git a/notebooks/ePix100/Correction_ePix100_NBC.ipynb b/notebooks/ePix100/Correction_ePix100_NBC.ipynb
index 052067fe3fbb6712d98ed7b0aa173441568de856..33089c104328a0d62f90021f329343ce285c3e69 100644
--- a/notebooks/ePix100/Correction_ePix100_NBC.ipynb
+++ b/notebooks/ePix100/Correction_ePix100_NBC.ipynb
@@ -296,8 +296,9 @@
     "missing_dark_constants = set(\n",
     "    c for c in [\"OffsetEPix100\", \"NoiseEPix100\"] if c not in const_data.keys())\n",
     "if missing_dark_constants:\n",
-    "    raise KeyError(\n",
-    "        f\"Dark constants {missing_dark_constants} are not available for correction.\")\n",
+    "    raise ValueError(\n",
+    "        f\"Dark constants {missing_dark_constants} are not available to correct {karabo_da}. \"\n",
+    "        \"No correction is performed!\")\n",
     "\n",
     "if relative_gain and \"RelativeGainEPix100\" not in const_data.keys():\n",
     "    warning(\"RelativeGainEPix100 is not found in the calibration database.\")\n",
diff --git a/notebooks/ePix100/ePix100_retrieve_constants_precorrection.ipynb b/notebooks/ePix100/ePix100_retrieve_constants_precorrection.ipynb
index c955f1361df90ee809188539d3f6064a88a9f75b..258149ad8fea06c452b7dbeabfcd0a1a2ebc2529 100644
--- a/notebooks/ePix100/ePix100_retrieve_constants_precorrection.ipynb
+++ b/notebooks/ePix100/ePix100_retrieve_constants_precorrection.ipynb
@@ -164,8 +164,8 @@
     "missing_dark_constants = set(\n",
     "    c for c in [\"OffsetEPix100\", \"NoiseEPix100\"] if c not in epix_metadata[karabo_da].keys())\n",
     "if missing_dark_constants:\n",
-    "    raise KeyError(\n",
-    "        f\"Dark constants {missing_dark_constants} are not available for correction.\")\n",
+    "    raise ValueError(\n",
+    "        f\"Dark constants {missing_dark_constants} are not available to correct {karabo_da}. \")\n",
     "if relative_gain and \"RelativeGainEPix100\" not in list(epix_metadata.values())[0].keys():\n",
     "    warning(\"RelativeGainEPix100 is not found in CALCAT.\")\n",
     "\n",