If the File Creation Restriction setting in the Archer Control Panel (on the Installation Settings tab) is configured to either Blacklist or Whitelist certain file types, a file upload to an attachment field fails if the file has size of 0 KB.
(A 0 KB file is created when a new Microsoft Word file or text file is saved without entering any data in the file. Upload fails for both of these file types.)

Besides to the error message shown in the Upload dialogue box, the following error is written to the archer.w3wp logs:
Message>Object reference not set to an instance of an object.</Message> <Source>ArcherTech.Common</Source> <StackTrace> at ArcherTech.Common.ErrorHandling.Rules.Repository.TextFileValidator.IsValid(Stream fileStream) at ArcherTech.Common.ErrorHandling.Rules.FileExtensionsUploadRule.IsValid(Stream fileStream, String extension)
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