Fix error string
@@ -288,8 +288,8 @@ class SQLAlchemySocket:
if projection and exclude:
raise AttributeError(f'Either projection (include) or exclude can be '
- 'used, not both at the same query. '
- 'Given projection: {projection}, exclude: {exclude}')
+ f'used, not both at the same query. '
+ f'Given projection: {projection}, exclude: {exclude}')
prop, hybrids, relationships = className._get_col_types()
