Magento

We have been trying to solve this but need help to find the solution. We checked the tables with the database repairtool 1.0 and also tried several backup restore points but nothing helped. The symptom is that when you open through the Admin Panel the Catalog and select Manage Products. Open any product with Edit on the right side. A lot of tabs are missing while the information exists in the database. These tabs do not appear:
- General
- Prices
- Meta information
- Images
- Description
- Design
- Recurring Profile
- Websites

Effect is that you cannot add and/or edit products anymore.

We always get these three error messages in the system log file:
2012-02-06T16:36:47+00:00 ERR (3): Warning: include(Mage/Booking/Helper/Yui.php) [<a href=’function.include’>function.include</a>]: failed to open stream: No such file or directory in /www/htdocs/pepa/store/lib/Varien/Autoload.php on line 93
2012-02-06T16:36:47+00:00 ERR (3): Warning: include(Mage/Booking/Helper/Yui.php) [<a href=’function.include’>function.include</a>]: failed to open stream: No such file or directory in /www/htdocs/pepa/store/lib/Varien/Autoload.php on line 93
2012-02-06T16:36:47+00:00 ERR (3): Warning: include() [<a href=’function.include’>function.include</a>]: Failed opening ‘Mage/Booking/Helper/Yui.php’ for inclusion (include_path=’/www/htdocs/pepa/store/app/code/local:/www/htdocs/pepa/store/app/code/community:/www/htdocs/pepa/store/app/code/core:/www/htdocs/pepa/store/lib:.:’) in /www/htdocs/pepa/store/lib/Varien/Autoload.php on line 93

Any help is very much appreciated.

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