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Error Message: Attention important additional information because of current Web.config configuration:
There exists the possibility that this exception happened because of a Session-Timeout or an App-Pool recycling.

Config mistake: DisplayType ="dropdown" is not supported in field <Field Type = "multipleselection" in Region "2" file "UIDefination.xml" Register "RegisterBiografie03" Name="MultipleSelection01">.
If you want to use dropdown, please change the field type to "dropdown". (Casenet.BO)