无法将List<Integer>输出获取到Katalon测试用例

import com.kms.katalon.core.annotation.Keyword
import com.kms.katalon.core.testdata.TestData

public class CustomKeywords {
    @Keyword
    public static String convertListToString(List<Integer> list) {
        StringBuilder sb = new StringBuilder();
        for (Integer num : list) {
            sb.append(num.toString());
            sb.append(", ");
        }
        // Remove the trailing comma and space
        sb.setLength(sb.length() - 2);
        return sb.toString();
    }
}

import static com.kms.katalon.core.testobject.ObjectRepository.findTestObject
import com.kms.katalon.core.model.FailureHandling
import com.kms.katalon.core.testdata.TestData
import internal.GlobalVariable

// Define your test steps here

List<Integer> numbers = [1, 2, 3, 4, 5]
String convertedString = CustomKeywords.'com.example.CustomKeywords.convertListToString'(numbers)
println("Converted List<Integer>: " + convertedString)