Seeing: JError: Unable to load JDom class : JDomHtmlFormInputSelect

Have created a Project called Simple, with a Table called Simple.
In Front End Layout I have Collection 'Simple', Item 'Simple Item'.
I have, when creating the Component in J-Cook, set a CSS Class of epContainer which exists in the simple.css file.

The error happens after (on back end) I Add a NEW Simple Item, then select it in the Collection list, and try to 'Edit' it...
It then simply re-draws on part of the screen and the Error occurs straight after the 'Ordering' field.

Is this something that I am doing wrong? Or a bug?

Kind Regards,

Edward

I checked everithing and seems ok.
maybe a file corrupted when you generated.

Is it still there if you regenerate ?