Statemachine workflow works fine in sharepoint 2010 but not in sharepoint 2013

Hi all,

I have implemented a state machine work flow using visual studio 2010 for a sharepoint 2010 web application and everything is working as expected.I try to open  the same solution in visual studio 2012 and made required changes in the proj file to build the solution without any errors. When i checked the workflow properties in visual studio 2012 it correctly shows the list name,workflow history list but not the task list(it is taking default "Tasks" as task list and i am using "sharepoint 2013" web application here) I have my own custom list to save the tasks but i didn't get that custom task list.Can any one please let me know what is the problem.

Thanks,

Rajesh