Why I cannot use the task name other than casperjs

[hasanyousuf]

I am having a issue that I cannot use other name for the tasks in my grunt file to execute. So, it means I cannot have multiple casperjs tasks in grunt file.

I want to have two casperjs tasks in my grunt file first task can login into the backend system and second task will perform remaining tasks. Reason for not using --pre option of casper because my tasks are dependent on command line argruments.