php - Getting Fatal error on executing a test on Behat+Mink+Selenium -


i executing test on behat+mink+selenium. below code have added in featurecontext.php:

 /**      * @given /^\|i on "([^"]*)"$/      */     public function iamon($arg1)     {         $this->visit($arg1);     } 

below error getting:

feature: drupal.org search   in order find modules on drupal.org   drupal user   need able use drupal.org search    @javascript   scenario: searching "behat"              # features\test1.feature:7  php fatal error:  call member function getsession() on null in c:\behat demo1\vendor\behat\mink-extension\src\behat\minkextension\context\rawmink context.php on line 103  fatal error: call member function getsession() on null in c:\behat demo1\vendor\behat\mink-extension\src\behat\minkextension\context\rawminkconte xt.php on line 103 

please help.