Chipscope Error

From: Zhane <me75@xxxxxxxxxxx>
Date: Mon, 28 Jul 2008 01:35:42 -0700 (PDT)

Checking expanded design ...
ERROR:NgdBuild:924 - bidirect pad net 'sender_BUS<4>' is driving non-
buffer
primitives:
pin D on block U_ila_pro_0/ila_pro_0/i_dq/g_dw/4/u_dq with type
FDP
ERROR:NgdBuild:924 - bidirect pad net 'sender_BUS<3>' is driving non-
buffer
primitives:
pin D on block U_ila_pro_0/ila_pro_0/i_dq/g_dw/3/u_dq with type
FDP
ERROR:NgdBuild:924 - bidirect pad net 'sender_BUS<2>' is driving non-
buffer
primitives:
pin D on block U_ila_pro_0/ila_pro_0/i_dq/g_dw/2/u_dq with type
FDP
ERROR:NgdBuild:924 - bidirect pad net 'sender_BUS<1>' is driving non-
buffer
primitives:
pin D on block U_ila_pro_0/ila_pro_0/i_dq/g_dw/1/u_dq with type
FDP
ERROR:NgdBuild:924 - bidirect pad net 'sender_BUS<0>' is driving non-
buffer
primitives:
pin D on block U_ila_pro_0/ila_pro_0/i_dq/g_dw/0/u_dq with type
FDP
====================================================================
my sender_BUS is INOUT ports

i've made net connections for my Data Trigger with "sender_BUS' of
base type IOBUF.

I'm not able to compile it now after adding the cdc file.

what can I do?
.

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