On BookMark creation title not getting updated

[nidhi8953]

createBookmark() {
this.object={
qInfo:{
qId: null,
qType: "bookmark"
},
qData:{
title:'hello',
description:'yoyoyooy'
}
};

return qdtCOmponet.qdtCOmponet.qDocPromise
.then(item => item.createBookmark(this.object))
.then(() => {
qdtCOmponet.qdtCOmponet.qDocPromise.then(item => item.doSave());
})
.catch(err => console.log(err));
}
}

Not able to update property title using this code , BookMark is getting created but title not working
KIndly help