用quaters7.2配置好的工程，用9.0打开编译后出错，何解？？？
用quaters7.2配置好的工程，用9.0打开编译后出错，出错信息如下：Error: Inconsistent I/O type for element "GPIO_0"
Error: Can't elaborate top-level user hierarchy
Error: Quartus II Analysis & Synthesis was unsuccessful. 2 errors, 0 warnings
Error: Peak virtual memory: 170 megabytes
Error: Processing ended: Wed Aug 11 21:15:58 2010
Error: Elapsed time: 00:00:01
Error: Total CPU time (on all processors): 00:00:01
Error: Quartus II Full Compilation was unsuccessful. 4 errors, 0 warnings
在7.2下编译还好好的，为什么在9.0下编译就会出错呢？
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