无法确定Yii2功能测试中的请求URI错误

Hi I am trying to make some yii2 app tests to work again, they where working ok, but after some vendors updates, calls to $I->amOnRoute(...) or $I->amOnPage(...) are failing with:

[yii\base\InvalidConfigException] Unable to determine the request URI.

Any idea of what can be causing this?