[Typo3] FE render error after install modified extension

[Diederik van Veen]

I wanted to create a new extension based on an existing extension, but keep 
the original one aswell. So I copy pasted the original extension folder in 
typo3conf/ext and modified all its files (names changes inside php files and 
filenames)  accordingly. After install this modified extension works fine in 
BE, but in FE results in a fatal error:

Fatal error: Cannot redeclare deba() (previously declared in 
C:\apache\htdocs\typo3conf\ext\jw_calendar\pi1\class.tx_jwcalendar_pi1_library.php:1474) 
in 
C:\apache\htdocs\typo3conf\ext\jw_callforpapers\pi1\class.tx_callforpapers_pi1_library.php 
on line 1448

while the funny thing is there are no 1448 lines (so how can i retrieve the 
error), but in general anyone has an idea what could be going wrong here. 
What is deba() ??

thx

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