Run Script error Line 9: tables.findAsync is not a function

Good afternoon everyone!

I have create an Office script in Excel to expand the columns and also add DataValidation. The script works fine in excel. But when I try to run it with Power Automate I get this error. Line 9: tables.findAsync is not a function. I'm not understanding the error as I don't have anything in the script that says findAsync. I would greatly Appreciate any help. Below is the script. Thanks in advance!

async function main(workbook: ExcelScript.Workbook) {
    // Get the active worksheet
    let sheet: ExcelScript.Worksheet = workbook.getActiveWorksheet("Sheet1");
    // Get all tables in the worksheet
    let tables: ExcelScript.Table[] = sheet.getTables();
    // Find the table named "Checklist"
    let table: ExcelScript.Table | undefined = tables.find(tbl => tbl.getName() === "Checklist");
    // If the table wasn't found, log an error and exit the script
    if (!table) {
        console.log("Error: Table 'Checklist' not found.");
        return;
    }
    // Get the range for Column C (Removed?) in the table
    let removedColumnRange: ExcelScript.Range = table.getColumnByName("Removed?").getRangeBetweenHeaderAndTotal();
    // Clear existing data validation (if any)
    removedColumnRange.getDataValidation().clear();
    // Define dropdown options as a comma-separated string
    const dropdownValues: string = "Yes,No";
    // Create validation rule
    const validationRule: ExcelScript.DataValidationRule = {
        inCellDropdown: true,
        list: {
            inCellDropdown: true, // Corrected the typo here
            source: dropdownValues
        }
    };
    // Set the validation rule
    removedColumnRange.getDataValidation().setRule(validationRule);
    // Auto-fit the columns in the table
    let tableColumns: ExcelScript.TableColumn[] = table.getColumns();
    tableColumns.forEach((column) => {
        column.getRange().getFormat().autofitColumns();
    });
}