When adding a new Event in the Calendar, I get the following warnings in eZ Debug:

Warning: eZTemplate:ezdesign
Design element javascript/ezoe/ez_core.js does not exist in any design

Warning: eZTemplate:ezdesign
Tried files: extension/ezteamroom/design/ezteamroom/javascript/ezoe/ez_core.js, design/base/javascript/ezoe/ez_core.js, extension/selenium/design/standard/javascript/ezoe/ez_core.js, extension/ezevent/design/standard/javascript/ezoe/ez_core.js, extension/ezteamroom/design/standard/javascript/ezoe/ez_core.js, extension/ezlightbox/design/standard/javascript/ezoe/ez_core.js, extension/ezxmlinstaller/design/standard/javascript/ezoe/ez_core.js, extension/ezmultiupload/design/standard/javascript/ezoe/ez_core.js, extension/ezjscore/design/standard/javascript/ezoe/ez_core.js, design/standard/javascript/ezoe/ez_core.js

Steps to reproduce

1. Access the teamroom siteaccess of your eZ Publish installation
2. Login as admin
3. On the ezteamroom frontpage click on Create new teamroom
4. Enter the information:
    Name: Teamroom 1
    Access: Private
    Feature list: Calendar

5. Click on Create
6. Run the frequent cronjob

Verify that creating an event in a calendar in a teamroom works

1. Go to Sitemap -> Calendar under "Teamroom 1"
2. Click on the button Add new event
3. Enter the information:
    Full title: Play squash
    Short title: Squash
    Description: In Oslo
    Date: Type=normal, select current date for both From and To dates by clicking on the calendar icon
    Location: Oslo

4. Verify the warnings in eZ Debug