[Typo3-UG Australia] installation of "Front End User Registration" Extension has crashed entire site!

[Benjamin Ward]

hi typo3.oz people,


my apologies if the answer to this can be found elsewhere, but ive 
trawled all the docs to no avail, and im pretty desperate!

MY PROBLEM:
I just tried to install the Extension "Front End User Registration" to 
my Typo3 site (version typo3_src-3.5.0). and it has crashed my whole 
site, front end and back! all pages report this error.


"""
Fatal error: Call to undefined function: addpiflexformvalue() in 
/hsphere/local/home/ro/typo3conf/temp_CACHED_ps8e3d_ext_tables.php on 
line 1334
"""

these are those lines:

1331>> // Adds the two plugins to the TCA
1332>>3lib_extMgm::addPlugin(Array('LLL:EXT:newloginbox/locallang_db.php:tt_content.list_type1',$_EXTKEY.'_pi1'),'list_type');
1333>>t3lib_extMgm::addPlugin(Array('LLL:EXT:newloginbox/locallang_db.php:tt_content.list_type3',$_EXTKEY.'_pi3'),'list_type');
1334>>t3lib_extMgm::addPiFlexFormValue($_EXTKEY.'_pi1','FILE:EXT:newloginbox/flexform_ds.xml');
1335>>t3lib_extMgm::addPiFlexFormValue($_EXTKEY.'_pi3','FILE:EXT:newloginbox/flexform_ds_pi3.xml');

(sorry about any wrapping)

copies of localconf.php and temp_CACHED_ps8e3d_ext_tables.php can be 
viewed here:

http://d45477.tmp28.quadrahosting.com/err/

the Extension manager said the module installed ok after i elected to to 
make the necessary table changes/cache clear etc. then the next button i 
clicked (which i think was the "Page" module link) produced the error 
above - but i think i could of clicked anything. now the whole site is 
disabled! I had preveously successfully installed some extentions.


- Any insights into what i my have done wrong?

- Is it a version issue? i assume others have successfully used this 
extension?

- Is there any way i can "roll back" to a state of the system to prior 
to the installation of the extension?

Please - any help would be much appreciated.


kind regards,

ben.