Hi All, i development with GLASS and i found this problem: i work araund the Error for MADescription with autoAccessor. The problem is because first i rendering one subset of the description of the anModel with: A) html render: ( descriptionKeyA descriptionKeyB ) asComponentOn: anModel and after rendering all the descriptions with: B) self call: ( anModel asComponent addMessage: 'Input dati'; addValidateForm; yourself) I don't understand, but the system in this mode don't work. This problem is only for the first time when description of the class and the relative structure and methods isn't alignment. After when all is alignment all work. In Squeak ( where it works fine ) i see: when at A) the system compile the class of model for the number of ( descriptionKeyA descriptionKeyB ) with autoAccessor set and generated the relative I/O methods at B) the system compile the class of model for the number of other description of model( descriptionDatoA descriptionDatoB ) with autoAccessor set and generated the ralative methods I think one temporany 'solution' is when i change one class with some descriptions set with autoAccessor to update the structure with a specific command anClass 'updateMAStructure' I remain in everyway on disposal for eventual explanations. Yours faithfully Dario