Understanding ERROR_NOT_SUBSTED 137 (0x89) and Effective Solutions

The error message ERROR_NOT_SUBSTED with code 137 (0x89) signifies that a program is attempting to delete a drive substitution that isn’t currently present. This situation can arise due to several factors, such as the drive letter not being substituted at all, the substitution having been deleted before, or simply a mistake in typing the drive letter or path.

How Can I Resolve the ERROR_NOT_SUBSTED 137 (0x89)?

1. Verify Existing Substitutions

1. Press the Windows key, input cmd in the search field, then select Run as administrator to open Command Prompt with elevated privileges.
2. Enter the following command to display a list of all currently assigned drive substitutions and press Enter: SUBST

2. Accurately Remove the Substitution

1. Press the Windows key, type cmd in the search bar, then select Run as administrator.
2. To remove the substitution drive, ensure you use the correct letter. Type this command, replacing [Drive:] with the actual drive letter you wish to delete, and then hit Enter: SUBST [Drive:] /D

3. Verify the Path

When utilizing the SUBST command on Windows, it’s essential to check the current drive substitution list to mitigate errors like ERROR_NOT_SUBSTED.

Thus, before executing any commands related to drive substitutions, use the SUBST command to review the current list. If the drive letter intended for deletion appears on this list, it indicates a valid substitution; conversely, if it does not show up, it may imply that the drive was never subjected to substitution or has already been erased.

Moreover, if the ERROR_NOT_SUBSTED error occurs during the execution of a script or program, verify that the code accurately references existing substitutions. If you confirm everything is correct on your end, consider restarting your computer.

If you have further queries or suggestions regarding the ERROR_NOT_SUBSTED error, please feel free to leave a comment below.

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