Categorie Error

[Quad]

Hi,

 

I have a small problem with the left main categorie.

We use a custom theme, yesterday we removed the rule in product-list.php so the word "on stock" will be removed with the articles.

 

It works great, but now the left categorie doesn't work anymore when you click on it it gives server error 500.

When you click on the product it self it gives no error.

 

Changed the php file back to default theme but problem remains.

 

I'm using 1.5.4.0.

 

Can someone help me out with this?

 

thanks

michael