project deployment model error

we've upgraded ssis 2008 R2 packages to 2012. All the packages converted to 2012 successfully. Im trying to convert the solution from package deployment model to project deployment model. few packages giving below errors while converting

Exception of type 'System.OutOfMemoryException' was thrown. (Microsoft.SqlServer.ManagedDTS).
Pls let me know how to fix this issue.

Thanks in advance