errors

1. this class is not key value coding-compliant for the key progress
   此时需查看IBAction的链接，查看控件的action链接有无问题

2.Impossible to set up layout with view hierarchy unprepared for constraint.
constraint是代码写的，怀疑是代码写的constraint某处出现了问题，此问题未解决，使用storyboard代替了代码constraint。

3.warnning: directory not found for option '-F/Users/liuting/Downloads/projects/LTDouBanFM/LTDouBanFM/build/Debug-iphoneos'
看看是不是general里面linked frameworks and libraries里面是不是之前加过framework后来删掉

4.Domain=NSCocoaErrorDomain Code=3840 "Invalid value around character 0." UserInfo={NSDebugDescription=Invalid value around character 0.}
明明之前还可以