[TYPO3] Strange Warning: Invalid argument supplied for foreach() in...

[Katja Lampela]

This was the date2cal extension, removed it and no more errors.

Katja Lampela kirjoitti:
> Hi all,
>
> I was trying to check why installing the extension "Differentiated 
> formmail recipients" (julle_diffformmailrcp) caused the front end go 
> completely blank and I enabled in the install tool the sglDebug and 
> displayErrors.
>
>
> After de-installing the extension everything went back to normal and I 
> also compared the tables and everything is fine according to the 
> install tool.
>
> Now - the error displaying still on, the weird thing happens: I get 
> this error message in the left BE frame top everytime I hit "Clear 
> cache in typo3conf":
>
> *Warning*: Invalid argument supplied for foreach() in 
> */home/mydomain.com/html/typo3conf/temp_CACHED_ps4f0f_ext_tables.php* 
> on line *2675*
>
> And the warning stays there even though every module works alright and 
> everything seems to be just fine.
>
> Everytime I hit "Clear FE cache" the error disappears and stays away 
> until I hit the "Clear cache..." again.
>
> Is this something I should worry and any idea what could cause this?
>
> TYPO3 is 4.1.2, php 5.1.6, MySQL 5.0.27.
>
> - Katja