diff --git a/src/action_class_hash_array.cc b/src/action_class_hash_array.cc
index 5ee938395..45223de76 100644
--- a/src/action_class_hash_array.cc
+++ b/src/action_class_hash_array.cc
@@ -25,6 +25,7 @@
    MEMBERS    = char* masterDir
    MEMBERS    = char* localDir
    MEMBERS    = char* ecmfDir
+   MEMBERS    = char* full_path
    MEMBERS    = int nofail
    END_CLASS_DEF
 
@@ -56,6 +57,7 @@ typedef struct grib_action_hash_array {
     char* masterDir;
     char* localDir;
     char* ecmfDir;
+    char* full_path;
     int nofail;
 } grib_action_hash_array;
 
@@ -159,6 +161,8 @@ grib_action* grib_action_create_hash_array(grib_context* context,
     else
         a->ecmfDir = NULL;
 
+    a->full_path = NULL;
+
     if (defaultkey)
         act->defaultkey = grib_context_strdup_persistent(context, defaultkey);
 
@@ -296,6 +300,7 @@ static grib_hash_array_value* get_hash_array_impl(grib_handle* h, grib_action* a
                          self->basename, master, ecmf, local, context->grib_definition_files_path);
         return NULL;
     }
+    self->full_path = full;
 
     grib_context_log(h->context, GRIB_LOG_DEBUG,
                      "Loading hash_array %s from %s", ((grib_action*)self)->name, full);
@@ -324,3 +329,9 @@ grib_hash_array_value* get_hash_array(grib_handle* h, grib_action* a)
     GRIB_MUTEX_UNLOCK(&mutex);
     return result;
 }
+
+const char* get_hash_array_full_path(grib_action* a)
+{
+    grib_action_hash_array* self = (grib_action_hash_array*)a;
+    return self->full_path;
+}
diff --git a/src/eccodes_prototypes.h b/src/eccodes_prototypes.h
index 3c32efe98..c6e6e9e17 100644
--- a/src/eccodes_prototypes.h
+++ b/src/eccodes_prototypes.h
@@ -74,6 +74,7 @@ int get_concept_condition_string(grib_handle* h, const char* key, const char* va
 /* action_class_hash_array.cc*/
 grib_action* grib_action_create_hash_array(grib_context* context, const char* name, grib_hash_array_value* hash_array, const char* basename, const char* name_space, const char* defaultkey, const char* masterDir, const char* localDir, const char* ecmfDir, int flags, int nofail);
 grib_hash_array_value* get_hash_array(grib_handle* h, grib_action* a);
+const char* get_hash_array_full_path(grib_action* a);
 
 /* action_class_set.cc*/
 grib_action* grib_action_create_set(grib_context* context, const char* name, grib_expression* expression, int nofail);
diff --git a/src/grib_accessor_class_hash_array.cc b/src/grib_accessor_class_hash_array.cc
index 987e68481..d191a5232 100644
--- a/src/grib_accessor_class_hash_array.cc
+++ b/src/grib_accessor_class_hash_array.cc
@@ -203,6 +203,11 @@ static grib_hash_array_value* find_hash_value(grib_accessor* a, int* err)
         grib_context_log(a->context, GRIB_LOG_ERROR,
                          "hash_array: no match for %s=%s",
                          a->creator->name, self->key);
+        const char* full_path = get_hash_array_full_path(a->creator);
+        if (full_path) {
+            grib_context_log(a->context, GRIB_LOG_ERROR, "hash_array: file path = %s", full_path);
+        }
+        grib_context_log(a->context, GRIB_LOG_ERROR, "Hint: Check the key 'masterTablesVersionNumber'");
         return NULL;
     }
     return ha_ret;