Error on installing and uninstalling add ons?

Been trying to fix this bug for over 2 weeks now. Anybody care to help me out? I've tried so many things. I've tried rebuilding master data, and I've tried emptying the tab;e "xf-data_registry". I've done so many other things, and have had no luck.



Server Error

unserialize() [function.unserialize]: Error at offset 0 of 1 bytes

1. XenForo_Application::handlePhpError() in XenForo/Model/StyleProperty.php at line 667
2. XenForo_Model_StyleProperty->updatePropertyCacheInStyle() in XenForo/Model/StyleProperty.php at line 632
3. XenForo_Model_StyleProperty->rebuildPropertyCacheInStyleAndChildren() in XenForo/Model/StyleProperty.php at line 2316
4. XenForo_Model_StyleProperty->importStylePropertiesFromArray() in XenForo/Model/StyleProperty.php at line 2187
5. XenForo_Model_StyleProperty->importStylePropertyXml() in XenForo/Model/AddOn.php at line 325
6. XenForo_Model_AddOn->importAddOnExtraDataFromXml() in XenForo/Model/AddOn.php at line 225
7. XenForo_Model_AddOn->installAddOnXml() in XenForo/Model/AddOn.php at line 169
8. XenForo_Model_AddOn->installAddOnXmlFromFile() in XenForo/ControllerAdmin/AddOn.php at line 178
9. XenForo_ControllerAdmin_AddOn->actionInstall() in XenForo/FrontController.php at line 310
10. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 132
11. XenForo_FrontController->run() in /home/exuura/public_html/forums/admin.php at line 13