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This will require editing of the core theme files and of which is not recommended as they will be overwritten when update comes.

If you know your way around, just look for the code below through...

The price slider display a min, max price based on all the ads that you have. This tutorial will show you how to make the price slider, show the price based on the ad category which will be a lot...

or check the chmod rights on that file, and chmod it to 777 and delete it

You may try asking your host's support as it might have something to do with the server settings.