according to error codes, some urls and user-specific codes (apiEndpointUrl, cognitoIdentityPoolId, etc.) should be defined.

being some of them kind of secret keys kept by the user, i think they should have been defined in the missing secret.dart file.

isn't it better to have a "shared" secret.dart file pre-filled with some string that the developer can then change on its own?

in the meanwhile my secret.dart looks like this:

final String apiEndpointUrl = "this-is-the-api-endpoint-url";
final String cognitoIdentityPoolId = "this-is-the-cognito-identity-pool-id";
final String cognitoUserPoolId = "this-is-the-cognito-user-pool-id";
final String cognitoClientId = "this-is-the-cognito-client-id";