swift - got error whe converting xcode6 to 7 -

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the error said "use of self in delegating initializer before self.init called". know how fix issue????

     convenience init(tweet: dictionary<string, string>) {     let _contents: string = ""     //var _date: string = ""     //var _reply_cnt: string = "0"     let _like_cnt: string = "0"     //var _bad_cnt: string = "0"     let _imageurl: string?       //code below reason why got error     self.init(contents:_contents, /*date:_date, reply_cnt:_reply_cnt, */like_cnt:_like_cnt,/* bad_cnt:_bad_cnt, */imageurl:imageurl)

going on limb here, variable in function called _imageurl, , parameter passed self.init call imageurl, perhaps variable invoking self.imageurl prior calling self.init error stating.


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