Sparkle appcast not working -

i'm having problem getting sparkle read appcast in website's root:

<?xml version="1.0" encoding="utf-8"?> <rss version="2.0" xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle"  xmlns:dc="http://purl.org/dc/elements/1.1/"> <channel> <title>myapp</title> <link>http://www.mywebsite.net/appcast.xml</link> <description> generate docs.     </description> <language>en</language> <item> <title>version 6.2 (1 new feature)</title> <sparkle:releasenoteslink>http://mywebsite.net/myapp.shtml</sparkle:releasenoteslink> <pubdate>sun, 28 jun 2015 19:20:11 +0000</pubdate> <enclosure url="http://ywebsite.net/downloads/myapp.zip" sparkle:version=“6.2” length=“1500000” type="application/octet-stream" /> <sparkle:minimumsystemversion>10.10</sparkle:minimumsystemversion> </item> </channel> </rss> 

in app i've added user preference:

[prefs setobject:@"http://www.mywebsite.net/appcast.xml" forkey:@"sufeedurl"]; [prefs synchronize]; 

when select 'check updates' menu item sparkle reports doesn't seem feed , logs:

sparkle: error: error occurred in retrieving update information. please try again later. error occurred while parsing update feed. 

i've seen post it's solution doesn't seem have helped (although sparkle did work ok when used sample appcast). presumably appcast wrong. i'd appreciate in correcting it.

make sure sparkle feed being served on https or mark 'allow arbitrary loads' yes in info.plist

<key>nsapptransportsecurity</key> <dict>     <key>nsallowsarbitraryloads</key>     <true/> </dict> 

you may try hassle-free build server http://amtourky.me/2016/01/20/mac-os-x-continuous-delivery-sparkler-the-missing-build-server-for-sparkle/