How to execute dtsx packages through command line

when i execute dtsx package through command line i am triggered with the following error saying

1.The connection is not found , the error is thrown by connections collection when the specific connection element is not found

2.Cannot resolve package path to an object in the package "xxxxxxx".Verify that the package path is valid

3.The package path referenced an object that cannot be found , this occurs when an attempt is made to resolve a package path to an object that cannot be found

But this works fine when i run the package through Business Intelligence development studio.