Completed
Last Updated: 26 Nov 2018 09:13 by ADMIN

This is a regression since R3 2018 - GitHub issue.
The issue is reproducible when title is set as window tag attribute:

<kendo:window name="mywindow" title="mytitle">
    <kendo:window-content>
        <div id="warning-new-container">
            Message
        </div>
    </kendo:window-content>
</kendo:window>

Loading a page with the above configuration throws the following exception:
Unable to convert string [mytitle] to class [com.kendoui.taglib.window.TitleTag] for attribute [title]: [Property Editor not registered with the PropertyEditorManager]

Workaround:
Instead of using title attribute, set the title through window-title tag:

<kendo:window name="mywindow">
    <kendo:window-title text="mytitle" />
    <kendo:window-content>
        <div id="warning-new-container">
            Message
        </div>
    </kendo:window-content>
</kendo:window>