diff --git a/primitives/npos-elections/solution-type/tests/ui/fail/wrong_page.stderr b/primitives/npos-elections/solution-type/tests/ui/fail/wrong_page.stderr
deleted file mode 100644
index d50157fad11c2..0000000000000
--- a/primitives/npos-elections/solution-type/tests/ui/fail/wrong_page.stderr
+++ /dev/null
@@ -1,38 +0,0 @@
-error[E0412]: cannot find type `Perbill` in this scope
- --> $DIR/wrong_page.rs:7:14
-  |
-7 |         Accuracy = Perbill,
-  |                    ^^^^^^^ not found in this scope
-  |
-help: consider importing this struct
-  |
-1 | use sp_arithmetic::Perbill;
-  |
-
-error[E0433]: failed to resolve: use of undeclared type `Perbill`
- --> $DIR/wrong_page.rs:7:14
-  |
-7 |         Accuracy = Perbill,
-  |                    ^^^^^^^ not found in this scope
-  |
-help: consider importing this struct
-  |
-1 | use sp_arithmetic::Perbill;
-  |
-
-error[E0119]: conflicting implementations of trait `std::convert::TryFrom<&[_npos::IndexAssignment<u8, u16, [type error]>]>` for type `TestSolution`
- --> $DIR/wrong_page.rs:3:1
-  |
-3 | / generate_solution_type!(
-4 | |     #[pages(1)] pub struct TestSolution::<
-5 | |         VoterIndex = u8,
-6 | |         TargetIndex = u16,
-7 | |         Accuracy = Perbill,
-8 | |     >(8)
-9 | | );
-  | |__^
-  |
-  = note: conflicting implementation in crate `core`:
-          - impl<T, U> TryFrom<U> for T
-            where U: Into<T>;
-  = note: this error originates in the macro `generate_solution_type` (in Nightly builds, run with -Z macro-backtrace for more info)