[fblpromise httpbody]: unrecognized selector sent to instance

Error: [fblpromise httpbody]: unrecognized selector sent to instance

Description: This error occurs when the code is trying to call a method, httpbody, on an object of type fblpromise, but the fblpromise class does not implement or recognize this method.

Solution: To fix this error, you need to check why the fblpromise object is being used in a context where the httpbody method is expected. There are a few possible reasons for this:

1. The object referenced by fblpromise is not of the expected type. Make sure that the object you are working with is actually an instance of a class that has a httpbody method defined.
2. The class fblpromise does not have a httpbody method defined. In this case, you either need to find a different method to achieve what you want, or you need to implement the httpbody method in the fblpromise class.
3. The fblpromise class is a third-party library or framework, and you are using it incorrectly. In this case, you should consult the documentation or support resources for the library or framework to understand how to use it properly.

Examples:

Example 1: Calling httpbody on an object of the incorrect type:

// Incorrect usage
fblpromise *promise = // initialize the object somehow
NSString *body = [promise httpbody]; // Error: unrecognized selector sent to instance

In this example, the variable promise is of type fblpromise, but it does not actually contain an object of the correct type. As a result, when the code tries to call the httpbody method on it, it throws an error because the fblpromise class does not implement this method.

To fix this, you need to make sure that promise contains an object of the correct type, such as an instance of a class that has a httpbody method defined.

Example 2: Implementing httpbody in the fblpromise class:

// fblpromise.h
@interface fblpromise : NSObject
// ... other methods and properties ...
- (NSString *)httpbody;
@end

// fblpromise.m
@implementation fblpromise
- (NSString *)httpbody {
    // implementation code goes here
    // return the http body string
}
// ... other method implementations ...
@end

In this example, the fblpromise class did not have a httpbody method defined. To fix this, we added the httpbody method declaration in the fblpromise.h interface file, and implemented it in the fblpromise.m implementation file.

Now, the code can call the httpbody method on objects of type fblpromise without encountering the “unrecognized selector” error.