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Problem with upgrade to 1.1.0

now i am getting this error in upgrading, please help;

Server Error
Server Error

Invalid data writer 'XenForo_DataWriter_EmailTemplate' specified
  1. XenForo_DataWriter::create() in XenForo/Model/EmailTemplate.php at line 483
  2. XenForo_Model_EmailTemplate->importEmailTemplatesAddOnXml() in XenForo/CacheRebuilder/ImportEmailTemplate.php at line 33
  3. XenForo_CacheRebuilder_ImportEmailTemplate->rebuild() in XenForo/ControllerHelper/CacheRebuild.php at line 26
  4. XenForo_ControllerHelper_CacheRebuild->rebuildCache() in XenForo/Install/Controller/Upgrade.php at line 232
  5. XenForo_Install_Controller_Upgrade->actionRebuild() in XenForo/FrontController.php at line 310
  6. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 132
  7. XenForo_FrontController->run() in /home/content/61/8430061/html/install/index.php at line 18