Unable to find writable var_dir

#0 /home/tiptopsh/public_html/app/code/core/Mage/Core/Model/Config/Options.php(66): Mage_Core_Model_Config_Options->getVarDir()
#1 /home/tiptopsh/public_html/lib/Varien/Object.php(112): Mage_Core_Model_Config_Options->_construct()
#2 /home/tiptopsh/public_html/app/code/core/Mage/Core/Model/Config.php(200): Varien_Object->__construct(Array)
#3 /home/tiptopsh/public_html/app/Mage.php(740): Mage_Core_Model_Config->__construct(Array)
#4 /home/tiptopsh/public_html/app/Mage.php(679): Mage::_setConfigModel(Array)
#5 /home/tiptopsh/public_html/index.php(100): Mage::run('tiptopshop_com_...', 'store')
#6 {main}