flutter test fails. compiler error getter not found 'main'

I'm trying to run flutter test using the terminal and i receive the following error. the following file C:/Users/User-45/AppData/Local/Temp/flutter_test_listener.e6fa92b4-6cd1-11e9-b9cb-68f728ca4610/listener.dart doesn't exist in the directory specified.

here's the error:

Compiler message: file:///C:/Users/User-45/AppData/Local/Temp/flutter_test_listener.e6fa92b4-6cd1-11e9-b9cb-68f728ca4610/listener.dart:46:17:

Error:Getter not found: 'main'. return test.main;

my project's directory is in another folder. how can i solve this? Thank you