After installing the plugin via MagentoGo, can't access site

[sofam]

Anything I try to touch, backend or frontend just ends me up with these reports, before installing the module I disabled all forms of caching and flushed all caches, any pointers? This is magento 1.6.20 CE:

a:5:{i:0;s:69:"Mage registry key "_singleton/turpentine/observer_esi" already exists";i:1;s:1037:"#0 /var/www/vhosts/xxx.dk/app/Mage.php(192): Mage::throwException('Mage registry k...')
#1 /var/www/vhosts/xxx.dk/app/Mage.php(446): Mage::register('_singleton/turp...', false)
#2 /var/www/vhosts/xxx.dk/app/code/core/Mage/Core/Model/App.php(1283): Mage::getSingleton('turpentine/obse...')
#3 /var/www/vhosts/xxx.dk/app/Mage.php(416): Mage_Core_Model_App->dispatchEvent('controller_fron...', Array)
#4 /var/www/vhosts/xxx.dk/includes/src/__default.php(17228): Mage::dispatchEvent('controller_fron...', Array)
#5 /var/www/vhosts/xxx.dk/app/code/core/Mage/Core/Model/App.php(743): Mage_Core_Controller_Varien_Front->init()
#6 /var/www/vhosts/xxx.dk/app/code/core/Mage/Core/Model/App.php(1086): Mage_Core_Model_App->_initFrontController()
#7 /var/www/vhosts/xxx.dk/app/code/core/Mage/Core/Model/App.php(349): Mage_Core_Model_App->getFrontController()
#8 /var/www/vhosts/xxx.dk/app/Mage.php(640): Mage_Core_Model_App->run(Array)
#9 /var/www/vhosts/xxx.dk/index.php(107): Mage::run('xxx', 'website')
#10 {main}";s:3:"url";s:72:"/index.php/spaceship22/cache/index/key/bcdfc46239cdd6d7071770df5f008446/";s:11:"script_name";s:10:"/index.php";s:4:"skin";s:9:"xxx";}

[aheadley]

First, I've never tested Turpentine on MagentoGo, but I don't think they provide a way for you to install Varnish. How are you planning on connecting Turpentine to a Varnish instance?

As for the error, it looks like you might have the Magento Compiler enabled, can you try disabling it? You can comment out the two define lines in includes/config.php since you can't access the backend.

[sofam]

Varnish was installed and tested beforehand, I am using nginx as a backend with php-fpm and apc.
In the config.php both lines are commented out, still can't access the backend.

[sofam]

That is, I only installed the module, I did not have a chance to do any other form of configuration after installing it. That's all I have done to the magento installation so far in regards to enabling turpentine, didn't have a chance to set it up with the varnish secret or anything.
I disabled the caches, installed the plugin and then I couldn't load any magento page.

[sofam]

Okay! I solved it, it was as you said, due to compilation, however disabling / clearing compilation did not do it, I had to clear and recompile. Not sure if there is a better way but this solved it for me.