Add and Remove errors in EditorTextField

I am using the following Custom EditorTextField inside a DialogWrapper:

class CustomTextField(project: Project, s: String) : LanguageTextField(XmlLanguage.INSTANCE, project, s) {

    override fun createEditor(): EditorEx {
        val editor = super.createEditor()
        editor.setVerticalScrollbarVisible(true)
        editor.setHorizontalScrollbarVisible(true)
        editor.isOneLineMode = false

        val settings = editor.settings
        settings.isLineNumbersShown = true
        settings.isAutoCodeFoldingEnabled = true
        settings.isFoldingOutlineShown = true
        settings.isLineMarkerAreaShown = false
        settings.isIndentGuidesShown = true
        settings.isAllowSingleLogicalLineFolding = true
        settings.isRightMarginShown = true

        val editorMarkupModel = editor.markupModel as EditorMarkupModel
        editorMarkupModel.isErrorStripeVisible = true
        editorMarkupModel.removeAllHighlighters()
        return editor
    }
}

The language of the EditorField is XML. When I load an "XML string" in this EditorField, I am getting multiple errors in the Right Margin like "Namespace not bound". I get nearly 50 - 60 errors. But I don't care about any of these errors at all.

I just want to get rid of all these Errors (suppress them) and add my own set of Errors. How do I do this?

I tried `editorMarkupModel.removeAllHighlighters()` but this doesn't have any impact on the errors.

Any help here is greatly appreciated. Thanks.