Error:(55, 1) property with 'retain (or strong)' attribute must be of object type

[arseniy-gl]

I do not understand what the problem is.
iOS8.1 (iPad 2)

#import "RestClient.h"
#import "SVHTTPRequest.h"

@implementation RestClient

-(id)init {
    [[SVHTTPClient sharedClient] setBasePath:@"http://172.16.7.14/"];
    [[SVHTTPClient sharedClient] GET:@"questions/all"
                          parameters:nil
                          completion:^(id response, NSHTTPURLResponse *urlResponse, NSError *error) {
                              NSLog(@"\n%@\n%@",response,urlResponse);
                          }];
    return self;
}

@end

[arseniy-gl]

pls, close this issues