Hi all, i would just like to share how i solved this problem. I used gantry and joomla 3.1.5 and when i ported everything to a shared server, this error kept coming up. I have built many joomla sites before so i knew it was not the configuration file issue. No back end admin login as well.. bummer! after 18 hrs of trial and error, i went back to the basics of troubleshooting and freshly copied a new gantryjoomla3 site and ran the installer, thats when i noticed the magic_quotes thingy was still on. Here was the strange part.. my hosting provider claimed it had been turned off 4 hrs ago and when i checked the phpinfo.. it showed that it was turned off! Take note that Joomla 3 cannot be installed without magic_quotes turned off. So i needed to write a php.ini file to locally turn it off (think this happens only for shared web hosting)
Anyway ,this forum entry gave me the clues to solved my problem in the end:viewtopic.php?f=708&t=812120
fire up notepad and type:
magic_quotes_gpc = Off
magic_quotes_runtime = Off
magic_quotes_sybase = Off
then save it as php.ini file.
Place it at your root directory
Modify the servers .htaccess file , add this line:
SetEnv PHPRC /<pathtoyourhomedir>/public_html/php.ini
Only after i did that, then the joomla 3 installer permitted me to install a fresh copy.
The strange part was that after i confirmed that joomla 3 could run on my server, i returned back to my original copied site and it still had the same issue of "Application Instantiation Error!" even when config files of my troubleshooting site and intended joomla site were the same!!
This made me believe that it could be some cache thing with joomla3. Anyway, in the end i just copied over whatever images folder over to the test site and updated the imported my database over and viola! Got it to work!
Hope this saves time for some..
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