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-rw-r--r--changelog.d/15614.bugfix1
-rw-r--r--synapse/config/appservice.py3
2 files changed, 2 insertions, 2 deletions
diff --git a/changelog.d/15614.bugfix b/changelog.d/15614.bugfix
new file mode 100644
index 0000000000..b523ae6eb1
--- /dev/null
+++ b/changelog.d/15614.bugfix
@@ -0,0 +1 @@
+Fix a bug introduced in Synapse 1.82.0 where the error message displayed when validation of the `app_service_config_files` config option fails would be incorrectly formatted.
diff --git a/synapse/config/appservice.py b/synapse/config/appservice.py
index fd89960e72..c2710fdf04 100644
--- a/synapse/config/appservice.py
+++ b/synapse/config/appservice.py
@@ -36,11 +36,10 @@ class AppServiceConfig(Config):
         if not isinstance(self.app_service_config_files, list) or not all(
             type(x) is str for x in self.app_service_config_files
         ):
-            # type-ignore: this function gets arbitrary json value; we do use this path.
             raise ConfigError(
                 "Expected '%s' to be a list of AS config files:"
                 % (self.app_service_config_files),
-                "app_service_config_files",
+                ("app_service_config_files",),
             )
 
         self.track_appservice_user_ips = config.get("track_appservice_user_ips", False)