ID:84021 Cannot use output port <name> of altmult_add megafunction with <name> device family

CAUSE: You specified an output port of the altmult_add megafunction; however, you cannot use the specified output port with the specified device family. This error usually occurs when you instantiate a megafunction directly in a text file rather than using the MegaWizard Plug-In Manager .

ACTION: If you want to use the specified output port, change the device family. If you want to use the specified device family, disconnect the specified input port. To avoid receiving this message in the future, Intel recommends using the MegaWizard Plug-In Manager.