When i purchase a product then on cart page after click on paypal checkout button it redirects from cart page to cart page again instead of redirecting to paypal .Why this happens. I am using same paypal express to my another site there it work fine .This issue occur i migrate my site from shared server to dedicated server... This is the extension.log file errors
Invalid block type: Mage_Tco_Block_Iframe Invalid block type: Mage_Wirecard_Checkout_Page_Block_Seamless_Script
These two lines from your error log suggest Magento isn't able to find your custom blocks (because it is prepending
Mage_ to the front). Check that permissions on your files are correct and the custom extensions are enabled.