What is LLDB RPC Server ? When does it crash in Xcode? Why it crashes?
In my case the LLDB RPC server consistently crashed every time I ran my app, even after cleaning the build folder and removing and reinstalling Xcode (Version 8.3.3 (8E3004b)) completely.
It turned out that apparently LLDB took objection to a breakpoint I had set, just moving this breakpoint by a line resolved the issue.
In my case: I update to Xcode Version 9.3 (9E145) recently and Xcode execute to the line with breakpoint then I type "po XXX" commend it will show the same message.I try to delete following files
~/Library/Preferences/com.apple.dt.Xcode.plist~/Library/Caches/com.apple.dt.Xcodeand it solved.not knowing exactly why but worth to try.
remember to backup those files in order to recovered in case any unexpected situation occur.