problem while adding externa MIG IP in design

[c4cheema]

Dear ALL I am facing this error time to time due to external IP


Place:1240 - Placement has failed for the IP core generated by MIG because
non-related components have been locked to slice locations required fo
the
MIG core. Please change or remove the location constraints for these
non-related components so that they don't conflict with MIG placement.
Below
is a list of the slice locations, and the component that is currentl
locked
to this location:
Slice Location Currently Locked Component
---------------- -----------------------------------
SLICE_X0Y42

mig_33_0/mig_33_0/u_ddr2_top_0/u_mem_if_top/u_phy_top/u_phy_io/gen_dq[5].u_io
b_dq/stg2a_out_fall

In my ucf I did not lock this variable
some time edk + ise generates bit file
but if i do some modification in rapper used to collect data from IP i
start giving errors

Kindly guide me how to remove those errors (I am not using gen_dq bit in m
wrapper)

Is there a way to reLOCK this pin
or bypass this error

Waiting for reply
Regards



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