I had a very strange error compiling my application, just like in the picture below, does anyone know what is going on?

Errors in the log:
Mistake: fail compilation.
Underlying Errors: Description: Couldn't compile connection: <IBCocoaTouchOutletConnection:0x400d6f420 <IBProxyObject:0x400d6e080> => nameShow => <IBUILabel: 0x400c7e0c0> Description: Couldn't compile connection: <IBCocoaTouchOutletConnection:0x400d71200 <IBProxyObject:0x400d6e080> => catShow => <IBUILabel: 0x400bf9280> Description: Couldn't compile connection: <IBCocoaTouchOutletConnection:0x400d6ffc0 <IBProxyObject:0x400d6e080> => numShow => <IBUILabel: 0x400be0380>
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