[TYPO3-templavoila] Sitemap Section Index + TV => Internal Server Error 500, PHP Fatal error

[Sebastian Runge]

Hello Group,

we update TV from 1.4.4 to 1.5.1. From now on, all websites with Section 
Index (pagecontent w/ Index checked) remain white and the server sends 
an Internal Server Error 500.

PHP Fatal error:
Call to undefined method tslib_cObj::readFlexformIntoConf()
templavoila/pi1/class.tx_templavoila_pi1.php on line 857

we try all 4 combinations:
TV: 1.5.0 und 1.5.1
TYPO3: 4.2.13 und 4.2.15

Is the bug known?

best regards
Sebastian