Unable to create or reconfigure Plesk domain: member does not exist (Error code 1387)

Alexander Davydov

Updated January 13, 2026 19:09

Plesk for Windows kb: technical

Applicable to:

Unable to create subdomain in Plesk:

A member could not be added to or removed from the local group because the member does not exist. (Error code 1387) at Unable to add the member (IWPD_1(johndoe)) to the group (IWPG_johndoe)
Repairing domain via command line with plesk repair web command fails with the same error message.

System user IWPD_1(johndoe) is missing on the server.

Note: johndoe should be replace with the corresponding username from the error message.

Connect to the server via RDP.
Open "Local Users and Groups" utility using the following CMD command:

lusrmgr.msc
Right-click on the Users folder and select "New User..." option to add new user.
Add missing user with the following options:
- User name: IWPD_1(johndoe)
- Description: Plesk IIS Worker Process Identity Account
- Unselect: User must change password at next logon option
- Select: User cannot change password and Password never expires options
Right-click on the added user and select "Properties" option.
Navigate to "Member Of" tab and press "Add..." to add psacln and IWPG_johndoe groups:
Regenerate website configuration:

plesk repair web example.com