please help.

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I have a lycos.co.uk account and have just uploaded via ftp all the files for 
phpweather 2.1.2, now when i click on the sites ftp client to show me my 
files, i had done as suggested and made a directory called, phpweather. now 
when i clicked on index.php, i had to obviously preview the file. it then 
gave me a message when read as follows. Fatal Error: cannot instantiate 
non-existent class: pw_db_null in db_layer.php on line 52.
What does this all mean? i have no experience in php, i do know that 
lycos.co.uk is using php 4 i think.
I had created a home page with their template, not because i did not have 
experience, simply to save time, until i had upload this php thingy. Please 
help me as soon as possible please.
How do i create my home page with with index.php?
Please tell me in easy to understand language, and geek lingo, many thanks
Aron Brookes