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Code issue: Button Icon - "source" is not a member of "". (M18) | "i" is declared more than once. (M107)

Hello, can you help with coding problems too ? Sorry I am a noob in coding.... Try to modify a git project for the new SDK 1.24

Sailfish OS SDK 1.24

import QtQuick 2.2
import Sailfish.Silica 1.0
..
...

IconButton {
id: sendButton
anchors.right: parent.right
anchors.bottom: parent.bottom
anchors.bottomMargin: Theme.paddingLarge
icon.source: "image://theme/icon-m-enter-accept"   **"source" is not a member of "". (M18)**

tyed this:

IconButton.icon: "image://theme/icon-m-enter-accept"

icon: "image://theme/icon-m-enter-accept"

but this did not work.... got this error from app output:

[W] modifyPageStack:113 - Error while modifying page stack: Error: Error while loading page: file:///usr/share/projekt123/qml/pages/ChatPage.qml:40 Non-existent attached object

[D] onError:208 - ERROR: file:///usr/lib/qt5/qml/Sailfish/Silica/PageStack.js:483: Error: Error while loading page: file:///usr/share/project123/qml/pages/ChatPage.qml:40 Non-existent attached object

./SailfishOS/mersdk/targets/SailfishOS-3.0.1.11-i486/usr/lib/qt5/qml/Sailfish/Silica/PageStack.js

481 if (pageComp) {
482 if (pageComp.status == Component.Error) {
483 throw new Error("Error while loading page: " + pageComp.errorString())
484 } else {
485 // instantiate page from component
486 page = pageComp.createObject(container, properties || {})
487 }

another issue:

function stringToColour(str) {
var hash = 0;
for (var i = 0; i < str.length; i++) {
hash = str.charCodeAt(i) + ((hash << 5) - hash);
}
var colour = '#';
for (var i = 0; i < 3; i++) {                                                   **"i" is declared more than once. (M107)**
var value = (hash >> (i * 8)) & 0xFF;
colour += ('00' + value.toString(16)).substr(-2);
}
return colour;
}

How to fix this ?