Xilinx EDK and Custom Peripheral: error occur when generating bitstream

hi all,

first, i am sorry for my poor English.

i use EDK 7.1i and ISE 7.1i.

imported custom peripheral with PLB Master Interface ( not from IFIP ) into my .xps project after overcame several problems.

In the step " generate netlist " there has no error or warning.

but in the step "Generate Bitstream",i got a error message "ERROR!! NgdBuild:455 plb_M_ABUS has multiple driver(s)": return code 2 abort.

already search this problem in xilix's answer database and tried modify the parameter of C_BaseAddr, but it is still stuck here.

does anyone meet this problem before?

thanks in advance.