getEndOffsetInclusive函数出错

我试图删除从文档的某个部分到文档末尾的所有文本。然而,当我运行以下代码时,我得到了一个错误:

TypeError: Cannot find function getEndOffsetInclusive in object Text. (line 79, file "Code")

var endOff = text.getEndOffsetInclusive();

以下是完整功能:

    function removeText() {
    var body = DocumentApp.getActiveDocument().getBody();
    var text = body.editAsText();
    var endOff = text.getEndOffsetInclusive();

    var search = "TESTHERE";
    var rangeElement = DocumentApp.getActiveDocument().getBody().findText(search);
    if (rangeElement.isPartial()) {
       var startOffset = rangeElement.getStartOffset();
       var endOffset = text.getEndOffsetInclusive();
       rangeElement.getElement().asText().deleteText(startOffset,endOffset);
    }

}

你知道为什么会出现这个错误吗?