diff --git a/src/locale/messages.en.json b/src/locale/messages.en.json
index 1c95af5ac2a62ecaf1a985e435c3dedfca58d291..a5defee46bdb502f1317ec6863161feb79187637 100755
--- a/src/locale/messages.en.json
+++ b/src/locale/messages.en.json
@@ -83,6 +83,8 @@
     "ERROR_STRUCTURE_ZDV_PAS_CALCULABLE": "Parameter \"Crest elevation\" cannot be calculated with this discharge law",
     "ERROR_STRUCTURE_Z_EGAUX_Q_NON_NUL": "Upstream and downstream elevations are equal but flow is not null",
     "ERROR_ELEVATION_Z1_LOWER_THAN_ZF1": "than the upstream bottom elevation of the ramp",
+    "ERROR_COEF_DEBIT_NULL": "Calculation is impossible when discharge coefficient is null",
+    "ERROR_D65_NULL": "Calculation is impossible when d65 is null",
     "INFO_CALCULATOR_CALC_NAME": "Calculator name",
     "INFO_CALCULATOR_CALCULER": "Compute",
     "INFO_CALCULATOR_CLONE": "Duplicate",
diff --git a/src/locale/messages.fr.json b/src/locale/messages.fr.json
index f98183ab445671965cd9328445a807712d7037c5..7c000f2508793dde8a81806c7b70c7abdcc40742 100755
--- a/src/locale/messages.fr.json
+++ b/src/locale/messages.fr.json
@@ -83,6 +83,8 @@
     "ERROR_STRUCTURE_ZDV_PAS_CALCULABLE": "Le paramètre \"Cote de radier\" ne peut pas être calculé avec cette loi de débit",
     "ERROR_STRUCTURE_Z_EGAUX_Q_NON_NUL": "Les cotes amont aval sont égales et le débit n'est pas nul",
     "ERROR_ELEVATION_Z1_LOWER_THAN_ZF1": "la cote amont est plus basse que la cote de fond amont de la rampe",
+    "ERROR_COEF_DEBIT_NULL": "Le calcul impossible à cause d'un coefficient de débit nul",
+    "ERROR_D65_NULL": "Le calcul impossible à cause d'un d65 nul",
     "INFO_CALCULATOR_CALC_NAME": "Nom du module de calcul",
     "INFO_CALCULATOR_CALCULER": "Calculer",
     "INFO_CALCULATOR_CLONE": "Dupliquer",