Hello!

I`ve uploaded a little site already a few months ago. Everything "seemed" more or less ok, but then one day an WARNING message (see attachment) started to occure from time to time. If you refresh the browser the message mostly disappears. As I am not a real coder - I am not really aware of how or where I can solce this problem.

You can find the live site here: http://alexfischer.org/

Any idea? I am sure its just a minor problem! Thanks in advance!

Seems like in you have some identical class-files existing in two locations at the same time. SilverStripe tries to load the same class twice, resulting in an error.

In this case extra copies of the files DatePickerField.php, SimpleHTMLEditiorField.php and SimpleTreeDropdownField.php are found in the dataobject_manager/code/ directory, where they don't belong.

In that case I would suggest a fresh install of the DataObjectmanager, by removing the existing directory first, to set everything straight. Then perform a /dev/build/?flush=1. Hope this helps.