Reference (Old Docs)
FBSDKShareConstants
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Constants
FBSDKShareErrorDomain
FBSDK_EXTER N NSString *const FBSDKShareErrorDomain;
Discussion:

Error codes from the SDK in the range 200-299 are reserved for this domain.

Declared In: FBSDKShareConstants.h
Typedefs
NS_ENUM

The error code for when a sharing dialog is not available.

typedef NS_ENUM(NSInteger, FBSDKShareErrorCode) {
/*!
*/
FBSDKShareReservedErrorCode = 200, /*!
*/
FBSDKShareOpenGraphErrorCode, /*!
*/
FBSDKShareDialogNotAvailableErrorCode, /*!
*/
FBSDKShareUnknownErrorCode,
};
Discussion:

Use the canShare methods to check for this case before calling show.

Declared In: FBSDKShareConstants.h
NS_ENUM(NSInteger, FBSDKShareErrorCode)

The error code for when a sharing dialog is not available.

typedef NS_ENUM(NSInteger, FBSDKShareErrorCode) {
/*!
*/
FBSDKShareReservedErrorCode = 200, /*!
*/
FBSDKShareOpenGraphErrorCode, /*!
*/
FBSDKShareDialogNotAvailableErrorCode, /*!
*/
FBSDKShareUnknownErrorCode,
};
Discussion:

Use the canShare methods to check for this case before calling show.

Declared In: FBSDKShareConstants.h