[Typo3] Warning Backend and Frontend - Template

[Ralf Beck]

Hallo,

I am a newbee and I got a problems with a warnings. I installed the WAMP 
Quickstart Package (later on I'll use it on a linux server) and a warning 
appeard after changes in a template for an new website. When I changed my 
template the the old status (I am absolutly sure about this) there were 
still this warnings.

There is one warning in the backend in the template at the Info/Modify view: 
Warning: mysql_fetch_row(): supplied argument is not a valid MySQL result 
resource in C:\typo3\apache\htdocs\w3\typo3\ext\tstemplate\ts\index.php on 
line 229.
In all pages in the frontend there is another warning: Warning: 
mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource 
in C:\typo3\apache\htdocs\w3\t3lib\class.t3lib_tstemplate.php on line 243. 
The rest of the page in the frontend is correct. When I had a look at FC 
Bigfeed I saw an empty page with the same frontend warning.
I allready deleted all cache tables with PhpMyadmin but I still have this 
problem. Can someone help me?