Fatal error

Hi,

I have installed "Status Messages Alter" module. After that i have added coding to my module. But it show error like this.

while using $matches = $messages->match() function it shows,
Fatal error: Call to a member function match() on a non-object in

while using $matches = $messages->contains() function it shows,
Fatal error: Call to a member function contains() on a non-object in

Any Idea? Thanks in advance....