Fatal Error: A second file trying to initialize

I have this...

Fatal error: Cannot redeclare postExpirator_init()

and then it gives me the two files trying to declare, including the file that is trying to redeclare.

I thought I could just add a little php that would check to see if the function had already been declared and if so, ignore the redeclare.

Can someone help me with that?

Regards,

Martin