If the problem continues, then the Transparency Flattener Presets file isn't the cause.
Illustrator creates a new Transparency Flattener Presets file. \Application Data\Adobe\Adobe Illustratorģ. Rename the Transparency Flattener Presets file (for example, to Transparency Flattener Presets.old) located in Documents and Settings\ Solution 1: Re-create the Transparency Flattner Presets file.Ģ. When you choose to save an Adobe Illustrator file as an AI or PDF file, the application returns the error message, 'An unknown error has occurred.'ĭo one or more of the following solutions: Support Knowledgebase Error 'An unknown error has occurred' when you save an Illustrator CS2 file (Windows XP)
