# Exception invoking method 'getAvailableIDs' in class sun.util.calendar.ZoneInfo

> This particular error message is indicative of a missing startup parameter for the application.

URL: https://www.hannonhill.com/cascadecms/latest/articles/cascade-administration/errors/exception-invoking-getavailableids.html
category: Cascade Administration
article-type: reference
content-kind: faq
release-availability: all
tags: errors
updated: 2026-10-06

This particular error message is indicative of a missing startup parameter for the application. To correct this problem, see the steps below for your operating system:

**Linux/*nix**

- Stop Cascade CMS
- Edit `cascade.sh`
- In the JAVA_OPTS, add the parameter `--add-opens=java.base/sun.util.calendar=ALL-UNNAMED`
- Save
- Start Cascade CMS

**Windows**

- Stop Cascade CMS
- Navigate into the folder `tomcat\bin`
- Right-click on the file `CascadeCMSw.exe` and select **Run as Administrator**
- In the Cascade CMS Properties dialog box that appears, click the **Java** tab
- In the **Java Options** section, add the parameter `--add-opens=java.base/sun.util.calendar=ALL-UNNAMED`
- Click **Apply/OK**
- Start Cascade CMS