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-rw-r--r--django/contrib/sessions/backends/cache.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/django/contrib/sessions/backends/cache.py b/django/contrib/sessions/backends/cache.py
index 0c7eb8d2cb..1b4906f923 100644
--- a/django/contrib/sessions/backends/cache.py
+++ b/django/contrib/sessions/backends/cache.py
@@ -43,7 +43,9 @@ class SessionStore(SessionBase):
continue
self.modified = True
return
- raise RuntimeError("Unable to create a new session key.")
+ raise RuntimeError(
+ "Unable to create a new session key. "
+ "It is likely that the cache is unavailable.")
def save(self, must_create=False):
if must_create: