.__TFC13DCGameKit_IOS20DCGameViewController14gameViewFinishfCSo7CALayerT_ is a mangled method name. I think there's a command-line tool to unmangle Swift names, but clearly it's:
module: DCGameKit_IOS
class: DCGameViewController
method: gameViewFinish
and code in the application is trying to call this method in the framework. (That suggests the subclass of DCGameViewController in the application does not override gameViewFinish.)
It looks like the Swift compiler thought that DCGameViewController.gameViewFinish was available to the application, but either it doesn't exist or isn't visible. Assuming you didn't do anything with linker commands to suppress the symbol, this might indicate that the Swift compiler is confused.
I'd suggest you submit a bug report with the project that shows the problem. Someone else might jump in with ideas, but it might be hard to find the problem via this forum.