The message C:\Windows\Twain_32.dll usually appears when the Desktop Experience Feature is not installed on Windows Server 2008 R2, 2012, 2012 R2. This Feature is a part of Windows Server 2008 and 2012 but it is disabled by default.

Please open Server Manager → Features and install the "Desktop Experience".

If it does not help you, please send to technical support* the AInfo report gathered from the machine where the issue occurs. This report (a ZIP file) can be created via the AInfo utility:

• Go to the Engine installation folder, \Bin\Support subfolder.
• Run AInfo.exe and click "Save".
• Wait for a few minutes until the report will be collected.
• send the result AInfo.zip to technical support*.

*Please see technical support contacts in support locator.