story mission

i was doing the mission with all the labory like she aske me to put some ramp on cars and jump over them but i crashed and after that i connected i start to do other challenge and my story mission is now in freeze like i don't know what i have to do and they say me you have to complete the mission for continue with this one but there is nothing on my screen i don't know what to do and in the mission section is nothing there juste a locked mission called "skatersation" in french and i just hear a girl saying you have a mission to finish but i don't know what to do play fix it or help me i want to playyyyy so bad