Fix bad wanted output error as requested

- UsageError -> Error

- include drv path too

src/libstore/build/derivation-goal.cc

@@ -1274,7 +1274,9 @@ void DerivationGoal::checkPathValidity()
     // If we requested specific elements, the loop above removes all the valid
     // ones, so any that are left must be invalid.
     if (!wantedOutputsLeft.empty())
-        throw UsageError("some wanted outputs are not provided by the derivation: %s", concatStringsSep(", ", wantedOutputsLeft));
+        throw Error("derivation '%s' does not have wanted outputs %s",
+            worker.store.printStorePath(drvPath),
+            concatStringsSep(", ", quoteStrings(wantedOutputsLeft)));
 }