The use of non-rectangular area group ranges causes PAR to report the following errors:
"WARNING:Ncd:515 - Could not find ncsite for <CLB_R8C8.*,CLB_R7C9.*:CLB_R8C10.S1>, not setting any extrema."
"FATAL_ERROR:Route:basrtareacst.c:792:184.108.40.206 - Invalid RouteArea Extrema. Process will terminate. To resolve this error, please consult the Answers Database and other online resources at http://support.xilinx.com. If you need further assistance, please open a WebCase by clicking on the "WebCase" link at http://support.xilinx.com"
Currently, Modular Design does not support the use of non-rectangular area group ranges. A non-rectangular area group range is created by specifying multiple area group ranges to a given area group. When Modular Design is used, each module can have only one area group range.