"Unable to convert data to string around character" error while requesting consent info about googleads-consent-sdk-ios HOT 5 OPEN

<NSHTTPURLResponse: 0x1c8032980> { URL: https://adservice.google.com/getconfig/pubvendors?es=2&plat=ios&v=1.0.1&pubs=pub-0123456789012345 } { Status Code: 200, Headers {
    "Access-Control-Allow-Origin" =     (
                                         "*"
                                         );
    "Cache-Control" =     (
                           private
                           );
    "Content-Disposition" =     (
                                 "attachment; filename=\"f.txt\""
                                 );
    "Content-Encoding" =     (
                              gzip
                              );
    "Content-Length" =     (
                            5545
                            );
    "Content-Type" =     (
                          "application/json; charset=windows-1251"
                          );
    Date =     (
                "Fri, 25 May 2018 09:01:27 GMT"
                );
    Server =     (
                  cafe
                  );
    "alt-svc" =     (
                     "hq=\"googleads.g.doubleclick.net:443\"; ma=2592000; quic=51303433; quic=51303432; quic=51303431; quic=51303339; quic=51303335,quic=\"googleads.g.doubleclick.net:443\"; ma=2592000; v=\"43,42,41,39,35\",hq=\":443\"; ma=2592000; quic=51303433; quic=51303432; quic=51303431; quic=51303339; quic=51303335,quic=\":443\"; ma=2592000; v=\"43,42,41,39,35\""
                     );
    p3p =     (
               "policyref=\"https://www.googleadservices.com/pagead/p3p.xml\", CP=\"NOI DEV PSA PSD IVA IVD OTP OUR OTR IND OTC\""
               );
    "timing-allow-origin" =     (
                                 "*"
                                 );
    "x-content-type-options" =     (
                                    nosniff
                                    );
    "x-xss-protection" =     (
                              "1; mode=block"
                              );
} }

NSString * dataString = [[NSString alloc] initWithData:data encoding:NSWindowsCP1251StringEncoding];
NSData * dataInUTFEncoding = [dataString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary<NSString *, id> *info = [NSJSONSerialization JSONObjectWithData:dataInUTFEncoding options:0 error:&error];

// From file PACPersonalizedAdConsent.m:328
NSDictionary<NSString *, id> *info = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];