12 July 2010 at 5:27am
It is tough to solve without the code that is causing the error - believe me ModelAdmin is stable. My first guess would be that you have misspelled one of the static $managed_models = array('nonexistentdataobject','mispelleddataobject'); - if you cannot see any errors there (and you are sure all your data bojects are loading e.g. the FileName.php matches the class FileName extends DataObject()) then post the code of the model admin and data objects managed and maybe I can be more help.
1 September 2010 at 12:28am
I just had a similar issue, found this thread so I thourght I'd add mine to it... I had a mangaed_model called 'XYZ' and then I defined a function within the ModelAdmin called 'XYZ'. Renaming the function sorted it all out...