This is some sort of bug associated with the Parse iOS 1.1.33 release as multiple people are seeing the same errors- myself included.
There are a couple of workarounds-
If you’re not using a library which requires the -ObjC linker flag, you can remove -ObjC from your project:
Build Settings > Other Linker Flags > remove -ObjC
or if you are using a library which requires that flag, you can add the Facebook SDK.
Both options will eliminate the errors. Hopefully they fix this as I have no need for the Facebook SDK in my app.
Follow the discussion here: