麻烦问一下大家有谁知道idea控制台下面出现Please perform full project rebuild(Build |rebuild Project)是什么情况啊？然后上面还报了一个Internal error (java.io.IOException): Couldn't copy [E:\p1302\p1302\web\WEB-INF\lib\c3p0-0.9.1.2.jar] to [E:\p1302\p1302\out\artifacts\p1302_war_exploded\WEB-INF\lib\c3p0-0.9.1.2.jar]这样的错误，求助大家，谢谢