diff --git a/backend/common/error.py b/backend/common/error.py
new file mode 100644
index 0000000..09882e2
--- /dev/null
+++ b/backend/common/error.py
@@ -0,0 +1,19 @@
+class SingleMessageError(Exception):
+    def __init__(self, message):
+        super().__init__(message)
+        self.message = message
+
+    def __str__(self):
+        return self.message
+
+
+class SQLBotDBConnectionError(Exception):
+    pass
+
+
+class SQLBotDBError(Exception):
+    pass
+
+
+class ParseSQLResultError(Exception):
+    pass