Undefined steps after running test from TestRunner class

I have a very strange situation, I have created Features and Scenarios in the feature file and corresponding step definitions and methods in the separate class.

I have run tests by running a feature file, and everything was fine, all tests were green.

But, when I run tests from TestRunner class, I got the following message:

Undefined step: Given I am on the Facebook Login page and suggested code.

You can implement missing steps with the snippets below:

@Given("^I am on the Facebook Login page$") public void i_am_on_the_Facebook_Login_page() throws Throwable { // Write code here that turns the phrase above into concrete actions throw new PendingException(); } 

I have noticed that the suggested method have underscore:

(i_am_on_the_Facebook_Login_page()) 

but my methods do not have underscore

(iAmOnTheFacebookLoginPage()) 

Does anybody have an idea why this happens? I can't run tests now even from the feature file.

Recently, I have started using Mac and IntelliJ instead of Windows and Eclipse.

Is it possible that IntelliJ causes the problem? P.S. I have used the option "Create step definition" from IntelliJ