Noob of the week is back

I launched a php scriot, and i got this:

Warning:  mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/a3540980/public_html/ucp2/inc/check.inc.php on line 88

Warning:  fread() [function.fread]: Length parameter must be greater than 0 in /home/a3540980/public_html/ucp2/header.php on line 42

Otherwise i can see the page.

Without seeing the code I can't tell you exactly what the problem is, but I can tell you what the messages mean:

The first warning (mysql_num_rows()) most likely means that a sql query failed. This may be syntax related or it could be a problem with the database.

The second warning (fread()) means that the second argument to fread is either 0 or a negative. Note that 0 == null == '' so if you have an unset variable as the length parameter you will get this message.

Post your code if you want a better answer.

For this error:

Warning:  fread() [function.fread]: Length parameter must be greater than 0 in /home/a3540980/public_html/ucp2/header.php on line 42

42.                $hostname      = fread($fp, $strlen);

The other error disappeared. And i know which .sql file im supose to execute, but when i do it it says that another file does already exist.

I dont know if im imoprting it right though :S

PhPMyAdmin:

Error

     SQL query:     
              --
-- Gegevens worden uitgevoerd voor tabel `backup`
--
 CREATE  TABLE  `useravatars` ( `id` int( 11  )  NOT  NULL  AUTO_INCREMENT  PRIMARY  KEY ,
 `Username` varchar( 30  )  NOT  NULL ,
 `picurl` TINYTEXT NOT  NULL ,
 `Description` TINYTEXT NOT  NULL 
);

     
      MySQL said:  
  #1050 - Table 'useravatars' already exists

looks like $fp and $strlen equal to null.
can you show how you've assigned those variables?