This internal error has been fixed in the NC-Sim simulator version 5.1 s010, the version supported by the Quartus II software version 4.1.
Article ID: 000085427 Content Type: Troubleshooting Last Reviewed: 09/11/2012
ncvhdl_cg: *internal* (Invalid case - nextVectorParamTemp())
BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description This internal error may occur in the NC-Sim simulator version 5.1 p005 when elaborating a Quartus® II-generated netlist.