Build operations are disabled:'project.xcworkspace' has changed and is reloading
I had similar issue with Xcode 9.3 and solution mentioned by @sssliver didn’t worked.
Below is solution that worked :
Quit Xcode (cmd + Q)and reopen projectDelete derived datacontent.Clean project (cmd + shift + K)Build project (cmd + B)
On Xcode 11 when I changed my app folder location, I got this error and thats was because Swift Package Manager was redownloading my project libraries, once it finished downloading, it worked again...