Prerequisite:
Switch to Salesforce Classic before performing the steps below.

Note: In some orgs, opening Documents in Classic view may display an error. If this occurs, manually navigate to the Documents page by replacing the URL path after the org domain with: /015/o

Example:
https://demoorg-1677510948279--omnilatest.sandbox.my.salesforce.com/015/o

Steps to resolve the issue:

1. Navigate to Documents.
2. In the Document Folders section, select "Vlocity Document Uploads" from the dropdown list.
3. Click New Document.
4. Set both Name and Unique Name to:
   VlocityLogoDocumentUploads
5. Attach the file provided in this article and click Save.

After the document is recreated, the OmniScript Designer should load without the error.