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I see error 'TWAIN Source Manager.Shlb': 'The application "Epson Scan" could not be launched because of a shared library error' in Mac OS X


  • Epson Scanner and All-In-One range
  • EPSON Scan
  • Mac OS X Snow Leopard (10.6)
  • Twain Source Manager


When attempting to use your Epson scanner software in Mac OS X, you may encounter the following error:

Application Launch Failure

The application "Epson Scan" could not be launched because of a shared library error: "< EPSON Scan >< EPSON Scan >< TWAIN Source Manager.Shlb >

There are several possible causes for this error: there may be a problem with the file "TWAIN Source Manager.Shlb", or an older version of EPSON Scan may be in use and requires updating for Snow Leopard (10.6).


First, we recommend uninstalling any Epson Scan software and reinstalling it using the latest available version.

Also, please be aware that you may experience issues using EPSON Scan if more than one version is installed. If you have more than one Epson scanning product (e.g. at least one All-In-One and one scanner), the following article may be of help to you:

If you continue to experience the same error message relating to the file, TWAIN Source Manager.Shlb, this indicates that there may be a problem with the file, e.g. it is corrupt or damaged, or may have been deleted. This is not an Epson file; it does not belong to EPSON Scan and is not included with the Epson software installation. However, this file is included in the latest version of Mac OS X Data Source Manager (DSM), available from third party websites.

To resolve this issue, you could try downloading and installing the latest version of the Mac OS X Data Source Manager (DSM). Please ensure that you observe any on-screen instructions or release notes provided by the vendor of this file.

Once installed, restart your Macintosh computer, then install the latest version of EPSON Scan from your product's Drivers & Software page on your local Epson Support website. After reinstalling the Epson software, make sure your Epson product is powered on and ready to scan, then attempt to use your Epson scanning software again.


This information is provided as is. Epson provides third-party contact information to help you find technical support.

Epson is not responsible for the content of third-party websites and the technical information and contact information may change without notice.

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