DE2-115 Web Server Example Problem

Hi. Place I hope you can give me a hand In DE2_115_WEB_SERVER_RGMII_ENET0 example. When I build this Project in Nios II IDE I face This Problem. /cygdrive/d/altera/11.0sp1/ip/triple_speed_ethernet/lib/sopc_builder/altera_triple_speed_ethernet/inc/triple_speed_ethernet_regs.h error: previous definition of 'mmac_cc_NO_LENGTH_CHECK_mask' was here.... /cygdrive/d/altera/11.0sp1/ip/triple_speed_ethernet/lib/sopc_builder/altera_triple_speed_ethernet/inc/triple_speed_ethernet_regs.h error: redeclaration of enumerator `mmac_cc_NO_LENGTH_CHECK_mask'https://www.alteraforum.com/forum/attachment.php?attachmentid=6468