Error Code 20 on a Mac


Like all computers, Macintosh, or Mac, computers can encounter system errors. Each error code represents a different problem and requires a specific action to solve it. Errors 17 to 24 deal with inaccessible system files.

Error 20

  • Error 20 on Mac operating systems--dsNoPk3" on older Mac systems--means the operating system is unable to locate a standard file directory known as Package 3. This error occurs when a user tries to open an installed program.


  • For Mac computers, packages are assigned specific roles to help the operating system function properly. They are found in the system file and contain data for applications on the hard drive.


  • Mac OS Error 20 is caused by a corrupted system file, and data may be lost. Correct this error by installing a new system file before trying to open the application again. To help prevent future data loss, back up your files to an external source on a regular basis.


  • Photo Credit working late_1 image by think jesters from
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