Shelf_router error : Closure call with mismatched arguments

Question

I am using Dart server and using Shelf_router. The route is configured as follows. The payroll api is mounted as follows:

app.mount('/payroll/', PayrollApi(db).router);

The PayrollApi has the following:

router.get('/employer/<erId>/frequency/<frequency>', erPayrollApi2);

The erPayrollApi2 functions is as follows:

 Future erPayrollApi2(shelf.Request req) async {
var erId = req.params['erId'];
var frequency = req.params['frequency'];

print(erId);
print(frequency);

shelf.Response.ok('Got message: f: $frequency, erId: $erId');

}

Sending the following URL using Postman:

https://localhost:843/apyroll/employer/<er100>/frequency/<Weekly>

I get the following error:

Exception has occurred. X
NoSuchMethodError (NoSuchMethodError: Closure call with mismatched arguments: 
function  *PayrollApi.erPayrollApi2
Receiver: Closure: (Request) => Future<dynamic> from Function

*erPayrollApi2": Tried calling: PayrollApi.erPayrollApiZ(Instance of "Request" "%3Cer100%3E" "%3CWeekly%3E") Found: PayrollApi.erPayrollApiZ(Request) => Future)

I am seeing the parameters 'er100' and 'Weekly' but stops shot of calling my function erPayrolApi2.

Answer 1

Changes written in comments above fixed the problem