Cant create Contracts Clauses with Automatic Numbering

Summary:

Dears,

I tried to make the numbering of contracts clauses come automatically and when i tried to save its gave me error.

i followed the below steps.

Your support is highly appreciated.

Best Regards,

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):