flutter A problem occurred evaluating project ‘:app‘.报错

先说错误发生环境：我从本地将代码上传github，因为想要与人合作，故先自己拉下来测试一下。结果同样的环境，却仍旧报错运行不起来。经过一天的艰苦奋斗，终于解决~万幸
一下是我的报错信息

去文件中找了一下相关位置，报错的是第30行，又说key.properties这个文件有问题，我猜测与我的打包key有关。果然，经过原项目与现在项目对比，我的项目中缺少了key.properties文件

原项目key.properties文件位置

这个文件被限制权限，没有传到github上，这个文件存放的是你的release的key相关信息
下面的文件存放的是key的配置，引用了key.properties的信息

综上：解决办法
1.找到原项目的key.properties文件，或者自己写一个key.properties文件，位置如上图3，配置打包key签名文件的相关信息，
2.key.properties的storeFile位置存放的是apk前面文件，位置可以改变，文件必须要有
apk签名文件创建方式
https://blog.csdn.net/huanglei201502/article/details/88533134

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