2 avalon-MM-read fifo block in matlab dspbuilder!

Hi all!

I design a project using Matlab-dspbuilder and SOPC builder. When I add 2 avalon-MM read fifo blocks in Matlab, compiling this .mdl file successfully. But when I generate files in SOPC builder, program has an error "dupplicate name Avalon-MM Slave". Can anyone show me how to solve this problems! Thanks!