QII5.1 调用SYNPLIFY8。1综合出现的错误？该如何解决

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f Using NativeLink to launch synthesis Tool
Inf Directory synplify_work exists --if you continue contents of directory may be overwritten
Error: Encountered error while running Synplify synthesis tool -- can't complete design synthesis
Inf See synplify_work/eth_top_v2.srr for messages generated by Synplify Synthesis
Error: Encountered error while running NativeLink synthesis script
Error: NativeLink flow failed to complete synthesis
Error: For messages from NativeLink scripts, check the file D:/Modeltech_6.0/eth_cii_v2_060704/quartus_nativelink_synthesis.log
Error: Quartus II Full Compilation was unsuccessful. 1 error, 1 warning