Compile time error when i drag and drop the CKEditor

Recently i drag and drop the CKEditor into my project. Once i build the xcode. it will show this error.
Multiple commands produce '/Users/Name/Library/Developer/Xcode/DerivedData/ProjectName-gjvywvnxzmgldogisbghmgkwtfmq/Build/Products/Debug-iphonesimulator/AppName.app/refresh.png':

What should i do?

Thanks in advance.