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编译器提示没有安装

 This project was created using a version of compiler that is not currently installed: 6.2.0 [C2000]. Please install the compiler of this version, or migrate the project to one of the available compiler versions by adjusting project properties. 
安装CCS5.5一段时间后,编译突然出现错误,提示上述信息。重装以后用了一段时间还是这样。求问怎么解决这个问题?