ID:11815 Cannot select asynchronous clear signals aclr2 or aclr3 for the <name> device family.

CAUSE: You selected more than two asynchronous clear signals for the specified device family; however, this feature is not supported. This error occurs when you instantiate a megafunction directly in a text file.

ACTION: Use the MegaWizard Plug-In Manager to regenerate the ALTERA_MULT_ADD megafunction with supported features for the specified device family.