[求助] 求助！关于生成bit时的报错问题

由于发端和接收端的时钟不同源，需要进行时钟同步，即码同步。我用了一个早迟门实现码同步，但是偶尔还是会有丢帧的现象。因此就想把发端板子和收端板子上的10.24M的时钟拉出来，接到一个板子的接口，然后用示波器观察。但是在生成bit文件的时候，就出现了如下的错误，这种怎么解决呢！？谢谢！！
ERROR:Bitgen:342 - This design contains pins which have locations (LOC) that are
   not user-assigned or I/O Standards (IOSTANDARD) that are not user-assigned.
   This may cause I/O contention or incompatibility with the board power or
   connectivity affecting performance, signal integrity or in extreme cases
   cause damage to the device or the components to which it is connected.  To
   prevent this error, it is highly suggested to specify all pin locations and
   I/O standards to avoid potential contention or conflicts and allow proper
   bitstream creation.  To demote this error to a warning and allow bitstream
   creation with unspecified I/O location or standards, you may apply the
   following bitgen switch: -g UnconstrainedPins:Allow
INFO:Bitgen:40 - Replacing "Auto" with "NoWait" for option "Match_cycle".  Most
   commonly, bitgen has determined and will use a specific value instead of the
   generic command-line value of "Auto".  Alternately, this message appears if
   the same option is specified multiple times on the command-line.  In this
   case, the option listed last will be used.
ERROR:Bitgen:157 - Bitgen will terminate because of the above errors.