Task dependency

[#1]

in the below shown image i want to do the task dependency , all the tasks which has been scheduled is success ,then only the aircrafts dashboard qvw should be run     i am facing an error 

can any please help me to solve the problem.

[its_anandrjs]

You have to select Aircrats.qvw in successful.

[#3]

i am not able to understand that how give the dependency