Fatal error: Cannot redeclare class ps_worldpay

[Thunderace]

If I'm getting the above error, then I assume that the variable has already been set.

how would I solve this?

[[Unknown]]

It means that a class is being defined twice.  Like this:

class abc
{
}

class abc
{
}

The same error would occur for functions.  In any case, it may mean you still have old files lingering about in your installation of the shop thing this is coming from.

-[Unknown]

[Thunderace]

It was a scripting error now solved, thanks for the answer