XF 1.1 Add-ons don't work for me

whenever i install the files it gives me (look below). I upload the files to the forum root but then it asks me if i want to replace the existing folder since the "library" folder already exists please help
Error: Please enter a valid callback method
 
Set your FTP program to merge the directories.

Server Error

Mysqli statement execute error : Table 'dark_taigachat' already exists
  1. Zend_Db_Statement_Mysqli->_execute() in Zend/Db/Statement.php at line 297
  2. Zend_Db_Statement->execute() in Zend/Db/Adapter/Abstract.php at line 479
  3. Zend_Db_Adapter_Abstract->query() in Dark/TaigaChat/Install.php at line 110
  4. Dark_TaigaChat_Install->_installVersion1() in Dark/TaigaChat/Install.php at line 83
  5. Dark_TaigaChat_Install::install() in XenForo/Model/AddOn.php at line 214
  6. XenForo_Model_AddOn->installAddOnXml() in XenForo/Model/AddOn.php at line 169
  7. XenForo_Model_AddOn->installAddOnXmlFromFile() in XenForo/ControllerAdmin/AddOn.php at line 178
  8. XenForo_ControllerAdmin_AddOn->actionInstall() in XenForo/FrontController.php at line 310
  9. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 132
  10. XenForo_FrontController->run() in /home/uegimmun/public_html/forums/admin.php at line 13
 
i'm not overwriting

You should upload the add on files inside the root of your forum folder preserving the structure intact.

Server Error

Mysqli statement execute error : Table 'dark_taigachat' already exists
  1. Zend_Db_Statement_Mysqli->_execute() in Zend/Db/Statement.php at line 297
  2. Zend_Db_Statement->execute() in Zend/Db/Adapter/Abstract.php at line 479
  3. Zend_Db_Adapter_Abstract->query() in Dark/TaigaChat/Install.php at line 110
  4. Dark_TaigaChat_Install->_installVersion1() in Dark/TaigaChat/Install.php at line 83
  5. Dark_TaigaChat_Install::install() in XenForo/Model/AddOn.php at line 214
  6. XenForo_Model_AddOn->installAddOnXml() in XenForo/Model/AddOn.php at line 169
  7. XenForo_Model_AddOn->installAddOnXmlFromFile() in XenForo/ControllerAdmin/AddOn.php at line 178
  8. XenForo_ControllerAdmin_AddOn->actionInstall() in XenForo/FrontController.php at line 310
  9. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 132
  10. XenForo_FrontController->run() in /home/uegimmun/public_html/forums/admin.php at line 13

It looks like the dark_taigachat table already exists at your database. Try to delete it and give the installer another go.
 
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